Well, World of Warcraft and Runescape, everybody at school plays one of them.
Or, well essentially any MMO with rightclick+hotbar combat (booooooring)
I could fill an entire list with reasons I dislike WoW but the main one was that I was expecting it to involve building player cities and attacking other factions player cities etc. You know it being based on an RTS series.
Also, Call of Duty. Not that I HATE them, just don't see what's so great about them.
Here in Malta its the only FPS game anyone plays.
Not exaggerating. Look here: http://lanthrax.com/game_server1.asp
Five Call of Duty servers, used to be a TF2 1 and about 3 for Left 4 Dead, no one really cared when they took them down, but one of the COD2 servers was down for a weekend and everybody was in an uproar.
So much that the phrase CoDoP (Call of Duty Only Player) was coined on the lanthrax forums; Ex. I know a guy at school who claims to be an "FPS Mastah" however he had never heard of Doom, Half-Life, Quake, Team Fortress, Halo and had only a vague idea what Counter-Strike was.
Real Life encounter by me with above CoDoP:
Me: have you seen Left 4 Dead?
Him: eh?
Me: That new zombie game from Valve, it looks epic!
Him:........COD2 zombies?
Me:-_-
Also, Need For Speed, just don't like it really. Also same as above, only racing game anyone plays here.
Most of all the FIFA series.
OK aside from the fact that i'm allergic to sports, it just sickens me how they release the same game every year with a different UI and slight grpahical improvements and everyone buys it up.