Can you trust Portal 2's Steam reviews? Adjusted rating 98.7%

Release date: 2011年4月18日 View on Steam

Official Steam rating
98.7%
468,312 reviews
Adjusted rating
98.7%
95% range 98.7%–98.8%
vs official ±0.0pt
Japanese-language reviews
96.9%
1,192 reviews
vs overall −1.8pt

Genuinely great 400 positive and 400 negative reviews analyzed · data as of 2026-10-12

Summary

Portal 2 holds an official Steam rating of 98.7%. After weighting 400 positive and 400 negative reviews by trust, the adjusted rating is 98.7% (95% range 98.7–98.8%), essentially the same as the official figure. Verdict: "Genuinely great" (the adjusted rating is 70% or higher and the positive reviews carry high average trust).

Average trust is 0.77 for positive and 0.75 for negative reviews, but the gap is too small to move the official rating much. The most common discount factor is very short reviews, at 44% of all reviews.

The monthly history (187 months) has no month where volume and negative share jumped together. The rating does not appear to be driven by a single episode.

The last 180 days show 98.3% (last 30 days: 98.2%), close to the all-time figure.

Japanese-language reviews (1,192) show 96.9%, close to the overall rating.

The adjusted rating estimates trust from how reviews are written; it does not judge any individual review as fake. Data as of 2026-10-12.

Positive vs negative breakdown

Share of sampled reviews that meet each condition that lowers trust. When a condition is more common on the positive side, the adjusted rating falls below the official one.

ConditionPositive reviewsNegative reviews
Under 2 hours played at review4%15%
Very short text44%35%
Key activated outside Steam8%13%
Received for free2%2%
Owns very few games13%6%
Over 100 reviews written1%5%
Average trust (1.0 = full)0.770.75

The median total playtime of the sampled reviewers is 9.6 hours.

Rating history

Monthly positive and negative review counts since release, as published by Steam.

Reviews per month (green = positive, red = negative)
0 2,000 4,000 6,000 8,000 2011-04: +754 / −1 2011-05: +276 / −2 2011-06: +73 / −0 2011-07: +589 / −0 2011-08: +117 / −1 2011-09: +65 / −0 2011-10: +192 / −1 2011-11: +128 / −3 2011-12: +886 / −1 2012-01: +218 / −0 2012-02: +71 / −1 2012-03: +126 / −0 2012-04: +87 / −3 2012-05: +287 / −1 2012-06: +109 / −0 2012-07: +939 / −1 2012-08: +270 / −0 2012-09: +189 / −0 2012-10: +101 / −0 2012-11: +153 / −1 2012-12: +392 / −0 2013-01: +288 / −3 2013-02: +137 / −0 2013-03: +170 / −1 2013-04: +291 / −2 2013-05: +282 / −1 2013-06: +213 / −0 2013-07: +455 / −0 2013-08: +208 / −1 2013-09: +182 / −0 2013-10: +185 / −0 2013-11: +578 / −2 2013-12: +2,248 / −13 2014-01: +1,168 / −10 2014-02: +698 / −5 2014-03: +550 / −8 2014-04: +1,171 / −10 2014-05: +772 / −3 2014-06: +1,978 / −13 2014-07: +1,079 / −14 2014-08: +1,203 / −11 2014-09: +842 / −9 2014-10: +744 / −13 2014-11: +630 / −9 2014-12: +1,812 / −20 2015-01: +1,565 / −16 2015-02: +1,131 / −12 2015-03: +720 / −2 2015-04: +563 / −11 2015-05: +532 / −8 2015-06: +1,590 / −25 2015-07: +818 / −16 2015-08: +623 / −8 2015-09: +489 / −4 2015-10: +488 / −11 2015-11: +1,360 / −26 2015-12: +1,994 / −26 2016-01: +1,610 / −28 2016-02: +1,240 / −31 2016-03: +783 / −17 2016-04: +576 / −8 2016-05: +586 / −9 2016-06: +987 / −13 2016-07: +1,182 / −20 2016-08: +561 / −18 2016-09: +539 / −6 2016-10: +869 / −21 2016-11: +6,183 / −16 2016-12: +1,877 / −13 2017-01: +1,783 / −33 2017-02: +1,044 / −17 2017-03: +735 / −18 2017-04: +595 / −6 2017-05: +591 / −16 2017-06: +2,474 / −51 2017-07: +3,219 / −70 2017-08: +1,180 / −37 2017-09: +876 / −20 2017-10: +795 / −11 2017-11: +5,313 / −27 2017-12: +2,516 / −50 2018-01: +2,255 / −35 2018-02: +1,486 / −24 2018-03: +1,116 / −19 2018-04: +768 / −14 2018-05: +885 / −12 2018-06: +1,431 / −44 2018-07: +1,771 / −30 2018-08: +867 / −22 2018-09: +641 / −15 2018-10: +576 / −10 2018-11: +5,089 / −42 2018-12: +1,369 / −35 2019-01: +1,260 / −29 2019-02: +1,067 / −22 2019-03: +740 / −21 2019-04: +671 / −10 2019-05: +750 / −20 2019-06: +5,305 / −44 2019-07: +6,162 / −70 2019-08: +772 / −21 2019-09: +575 / −11 2019-10: +816 / −13 2019-11: +4,425 / −34 2019-12: +7,750 / −77 2020-01: +5,284 / −58 2020-02: +3,124 / −49 2020-03: +3,820 / −34 2020-04: +4,926 / −50 2020-05: +4,023 / −47 2020-06: +3,962 / −44 2020-07: +6,403 / −66 2020-08: +3,456 / −50 2020-09: +2,843 / −31 2020-10: +2,690 / −26 2020-11: +5,201 / −60 2020-12: +6,008 / −82 2021-01: +5,772 / −63 2021-02: +3,522 / −36 2021-03: +4,057 / −50 2021-04: +4,228 / −49 2021-05: +3,608 / −55 2021-06: +3,733 / −52 2021-07: +5,606 / −76 2021-08: +3,570 / −54 2021-09: +2,468 / −34 2021-10: +2,265 / −35 2021-11: +4,211 / −56 2021-12: +4,825 / −68 2022-01: +5,582 / −72 2022-02: +4,287 / −45 2022-03: +3,336 / −52 2022-04: +2,810 / −37 2022-05: +2,371 / −32 2022-06: +2,976 / −50 2022-07: +4,164 / −74 2022-08: +2,621 / −42 2022-09: +2,052 / −38 2022-10: +2,131 / −53 2022-11: +4,640 / −77 2022-12: +6,379 / −93 2023-01: +5,967 / −88 2023-02: +2,778 / −43 2023-03: +7,063 / −123 2023-04: +3,575 / −70 2023-05: +3,572 / −56 2023-06: +2,753 / −44 2023-07: +6,044 / −109 2023-08: +4,344 / −80 2023-09: +4,307 / −79 2023-10: +3,048 / −58 2023-11: +4,303 / −62 2023-12: +4,507 / −81 2024-01: +6,712 / −131 2024-02: +3,425 / −58 2024-03: +4,150 / −76 2024-04: +2,748 / −41 2024-05: +3,184 / −58 2024-06: +3,072 / −127 2024-07: +5,574 / −99 2024-08: +3,086 / −57 2024-09: +1,982 / −41 2024-10: +3,776 / −65 2024-11: +4,172 / −54 2024-12: +4,714 / −93 2025-01: +3,653 / −64 2025-02: +4,268 / −68 2025-03: +3,696 / −79 2025-04: +2,226 / −43 2025-05: +2,183 / −33 2025-06: +2,980 / −67 2025-07: +3,996 / −80 2025-08: +2,504 / −40 2025-09: +1,858 / −31 2025-10: +2,535 / −45 2025-11: +2,250 / −40 2025-12: +3,219 / −59 2026-01: +3,718 / −52 2026-02: +2,142 / −35 2026-03: +2,602 / −45 2026-04: +2,209 / −38 2026-05: +2,020 / −35 2026-06: +2,134 / −34 2026-07: +3,254 / −57 2026-08: +1,983 / −43 2026-09: +1,725 / −28 2026-10: +1,076 / −19 2011/042012/012013/012014/012015/012016/012017/012018/012019/012020/012021/012022/012023/012024/012025/012026/01
Positive share per month (months under 30 reviews omitted)
0% 25% 50% 75% 100% Monthly data overall 98.5% 2011-04: 99.9%2011-05: 99.3%2011-06: 100.0%2011-07: 100.0%2011-08: 99.2%2011-09: 100.0%2011-10: 99.5%2011-11: 97.7%2011-12: 99.9%2012-01: 100.0%2012-02: 98.6%2012-03: 100.0%2012-04: 96.7%2012-05: 99.7%2012-06: 100.0%2012-07: 99.9%2012-08: 100.0%2012-09: 100.0%2012-10: 100.0%2012-11: 99.4%2012-12: 100.0%2013-01: 99.0%2013-02: 100.0%2013-03: 99.4%2013-04: 99.3%2013-05: 99.6%2013-06: 100.0%2013-07: 100.0%2013-08: 99.5%2013-09: 100.0%2013-10: 100.0%2013-11: 99.7%2013-12: 99.4%2014-01: 99.2%2014-02: 99.3%2014-03: 98.6%2014-04: 99.2%2014-05: 99.6%2014-06: 99.3%2014-07: 98.7%2014-08: 99.1%2014-09: 98.9%2014-10: 98.3%2014-11: 98.6%2014-12: 98.9%2015-01: 99.0%2015-02: 99.0%2015-03: 99.7%2015-04: 98.1%2015-05: 98.5%2015-06: 98.5%2015-07: 98.1%2015-08: 98.7%2015-09: 99.2%2015-10: 97.8%2015-11: 98.1%2015-12: 98.7%2016-01: 98.3%2016-02: 97.6%2016-03: 97.9%2016-04: 98.6%2016-05: 98.5%2016-06: 98.7%2016-07: 98.3%2016-08: 96.9%2016-09: 98.9%2016-10: 97.6%2016-11: 99.7%2016-12: 99.3%2017-01: 98.2%2017-02: 98.4%2017-03: 97.6%2017-04: 99.0%2017-05: 97.4%2017-06: 98.0%2017-07: 97.9%2017-08: 97.0%2017-09: 97.8%2017-10: 98.6%2017-11: 99.5%2017-12: 98.1%2018-01: 98.5%2018-02: 98.4%2018-03: 98.3%2018-04: 98.2%2018-05: 98.7%2018-06: 97.0%2018-07: 98.3%2018-08: 97.5%2018-09: 97.7%2018-10: 98.3%2018-11: 99.2%2018-12: 97.5%2019-01: 97.8%2019-02: 98.0%2019-03: 97.2%2019-04: 98.5%2019-05: 97.4%2019-06: 99.2%2019-07: 98.9%2019-08: 97.4%2019-09: 98.1%2019-10: 98.4%2019-11: 99.2%2019-12: 99.0%2020-01: 98.9%2020-02: 98.5%2020-03: 99.1%2020-04: 99.0%2020-05: 98.8%2020-06: 98.9%2020-07: 99.0%2020-08: 98.6%2020-09: 98.9%2020-10: 99.0%2020-11: 98.9%2020-12: 98.7%2021-01: 98.9%2021-02: 99.0%2021-03: 98.8%2021-04: 98.9%2021-05: 98.5%2021-06: 98.6%2021-07: 98.7%2021-08: 98.5%2021-09: 98.6%2021-10: 98.5%2021-11: 98.7%2021-12: 98.6%2022-01: 98.7%2022-02: 99.0%2022-03: 98.5%2022-04: 98.7%2022-05: 98.7%2022-06: 98.3%2022-07: 98.3%2022-08: 98.4%2022-09: 98.2%2022-10: 97.6%2022-11: 98.4%2022-12: 98.6%2023-01: 98.5%2023-02: 98.5%2023-03: 98.3%2023-04: 98.1%2023-05: 98.5%2023-06: 98.4%2023-07: 98.2%2023-08: 98.2%2023-09: 98.2%2023-10: 98.1%2023-11: 98.6%2023-12: 98.2%2024-01: 98.1%2024-02: 98.3%2024-03: 98.2%2024-04: 98.5%2024-05: 98.2%2024-06: 96.0%2024-07: 98.3%2024-08: 98.2%2024-09: 98.0%2024-10: 98.3%2024-11: 98.7%2024-12: 98.1%2025-01: 98.3%2025-02: 98.4%2025-03: 97.9%2025-04: 98.1%2025-05: 98.5%2025-06: 97.8%2025-07: 98.0%2025-08: 98.4%2025-09: 98.4%2025-10: 98.3%2025-11: 98.3%2025-12: 98.2%2026-01: 98.6%2026-02: 98.4%2026-03: 98.3%2026-04: 98.3%2026-05: 98.3%2026-06: 98.4%2026-07: 98.3%2026-08: 97.9%2026-09: 98.4%2026-10: 98.3% 2011/042012/012013/012014/012015/012016/012017/012018/012019/012020/012021/012022/012023/012024/012025/012026/01
Reviews per day, last 30 days
0 50 100 150 2026-09-13: +72 / −0 2026-09-14: +45 / −0 2026-09-15: +51 / −1 2026-09-16: +43 / −2 2026-09-17: +61 / −2 2026-09-18: +72 / −0 2026-09-19: +75 / −0 2026-09-20: +71 / −5 2026-09-21: +32 / −0 2026-09-22: +51 / −1 2026-09-23: +49 / −1 2026-09-24: +47 / −1 2026-09-25: +64 / −0 2026-09-26: +69 / −3 2026-09-27: +65 / −0 2026-09-28: +44 / −0 2026-09-29: +50 / −1 2026-09-30: +38 / −0 2026-10-01: +48 / −0 2026-10-02: +63 / −0 2026-10-03: +116 / −0 2026-10-04: +133 / −1 2026-10-05: +114 / −1 2026-10-06: +76 / −1 2026-10-07: +100 / −1 2026-10-08: +85 / −4 2026-10-09: +89 / −3 2026-10-10: +115 / −2 2026-10-11: +112 / −6 2026-10-12: +25 / −0 09/1309/2009/2710/0410/11

Recent sentiment

PeriodPositiveReviews
Last 30 days98.2%2,378
Last 180 days98.3%14,742
All time98.7%468,312
Japanese, last 180 days96.2%26

About this verdict

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