Not which game had the best balance, or hit detection, or the one where you had the highest KD in. Which game did you say, wow I'm having so much fun.
For me it MW2, going for Nukes, riot shield classes, javelin glitching, 18 player FFAs on rust, etc. Yeah I know OMA DC was annoying. Yeah MLC was annoying too but I honestly had such a good time whenever I played.
This game is probably a close second. I'm having a ton of fun with this game too.
CoD2 was the most fun even though it was broken it was the funnest and I think the maps were the best. The best altogether was MW1 though there's no competition, WaW is the only thing to come close but I never played it long enough to see it's endgame