Bioshock, call of duty: modern warfare (mw2 is worse, but more hated so I'll abstain from hating it like no doubt most other people have) and especially left 4 dead (and by extension it's sequel).
As has been said, Bioshock had a good atmosphere and pretty graphics, but the guns were bland and largely pointless. The gameplay was, at absolute best mediocre, steampunk has to be good to work for me, so it's one of those games I found wasn't worth the effort.
Call of duty modern warfare felt like a slap in the face after the awesome that was CoD2. Ridiculously unbalanced perks, out of game levelling and relatively crap maps made this game stand out poor for me. I know I said I'd abstain from spouting hate at MW2, but my reasons for hating aren't limited to it being the PC game designed to set up subscription based FPSs, I also genuinely dislike the game mechanics as it's more of the same.
Left 4 dead was boring as hell, 4 player half life with more zombies and less combine...yawn. The gunplay was atrocious, especially given how good every other FPS game released in the past few years have been[footnote]other than bioshock, of course.[/footnote]. I'd much sooner play Killing floor or TF2 than left 4 dead.