MW2:
Buy it. I hate the multiplayer at first because the screen is full of shit distracting me.
After I get used to it, I kinda started liking it. Fast paced infantry combat, I get to snipe people with a sniper full of gadgets. Good fun.
Then glitching gets really big. People start dong the javelin glitch. Move onto using dual models (not really a glitch but overpowered as hell). Every other game I play is a glitched ground war on Rust game. I get really pissed off.
Well, eventually the bugs got fixed, but because I did the mistake of prestiging, I lost my ninja, cold blooded and fall camo WA2000 with thermal and heartbeat. I start sucking, getting spawn killed and shit like that. I notice how Modern warfare has become modern campfare and leave.
6 months later, my friends start playing it again. I fight my way through camping, killstreak rewards and spawn kills for my hightech sniper equipment and good perks. Now I quite like it again.