100 point scale. Around 50% of that is my perceived quality of the game, on a technical aspect. The other 50% is my enjoyment of the game. Needless to say all of this is very subjective and often times I wont bother arguing for/against whatever game im rating because I find it to be a waste of time - precisely because its subjective.
Sometimes theres a game that I can acknowledge is immensely well crafted, I just dont find it fun to play, like (unpopular opinon) Red Dead Redemption 2.