Game Review Game Rating

Those ratings are worthless

Worthless is maybe an overstatement. One just has to keep in mind that isolated games means nothing much, also that shorter the game, lesser the importance of the said rating evaluation.

Perhaps there is a thing to do: evaluate your 20 last games and find the average (x/20), then see how far it actually is from your current rating. Maybe this would work better with a higher number of games, idk.

For one thing I'm lazy to do it, and then I can't really do that unless I do restrict myself to one game a day, cos free accts can't get more than one game a day evaluated...

One other thing as well, is that the formula used to estimate the Elo of the two players requires at least one of the players to have a rating. The PGN for the games played on Chess.com will contain this information in the header (the tags [WhiteElo "1000"], for example.
When it estimates the Elo for the game, it factors in that information. You can easily test this by just taking one of your games, download the PGN, and put higher or lower Elo values for the two players. The estimated Elo will go up or down, accordingly, showing how the estimate is not based solely on the moves played, but also includes information about the current Elo of the players.
As a guide to how you and your opponent played, I think if the estimated Elo's are higher than your actual Elo, you could take that as you played better than expected, and if lower, then you played worse than expected.
Given I can only do one a day, I've not played around too much with it, but I could imagine a game between two 800 rated players an estimate higher than 800 (say, the winner scored at 1000, so played better by 200 rating points) could result in a lower (but still higher) estimated Elo if one changed the players' Elo's to both be something like 2500; I could see that ending up with something like estimated Elo for the winner at say 2200 - so higher than the initial 1000 given to the 800 (you played better than expected) but indicating that the same game by a 2500 was played worse than expected. However, I don't know if that's true - it's just a possibility I've wondered about.

[Event "Vs. Computer"]
[Site "Chess.com"]
[Date "2024-05-21"]
[White "mdsheikhforid"]
[Black "Martin"]
[Result "1-0"]
[WhiteElo "800"]
[BlackElo "250"]
[TimeControl "-"]
[Termination "mdsheikhforid won by checkmate"]
1. e4 e5 2. f4 d6 3. Nf3 f6 4. Nc3 c5 5. Bc4 exf4 6. d3 Bd7 7. Bxf4 Bf5 8. exf5
a5 9. O-O Qc7 10. Re1+ Kd8 11. Qe2 Qc8 12. Qe8+ Kc7 13. Nb5+ Kb6 14. Qxc8 Be7
15. Bxd6 Bxd6 16. Re6 h5 17. Rxd6+ Nc6 18. Qc7+ Ka6 19. Na3+ Ka7 20. Nb5+ Ka6
21. Nbd4+ Ka7 22. Nxc6# 1-0

Hello

It made me feel good about myself though.