Crysis.
After Farcry, I expected better. Sure, the plot and characters were MUCH better in Crysis, but the gameplay was not. The guns all sucked horribly, and frankly when you're making a SHOOTER the guns need to be better! Crysis guns have horrible accuracy, as opposed to Farcry guns, the shotgun gets nerfed, the Rocket Launcher, originally a pile of fun in Farcry gets wussified, the submachine gun is crappy even at close range now, and the gatling gun is a raging pile of crap that you never have ammo for anyway. Of course, the reduction from 4 weapon slots to slots based on weapon type was annoying as hell, which meant only 2 rifle/shotgun slots (cause yeah, that pistol is worth having around instead of an extra rifle...)
The worst thing though is the poor accuracy of any of the guns. I loved Farcry because it mixed long range and close range combat so well, a thing I've not seen in ANY other shooter. Most shooter weapons suck horribly at long range, except for one sniper weapon thrown in to annoy you by requiring it in a couple spots, and being useless everywhere else. Conversely, about half the farcry weapons were very useful at long range, provided you took the time to aim. Somehow they even cocked up the machine guns in Crysis; in Farcry the big .50 on any jeep or mount could be used to take down things half a mile away, but in Crysis I had trouble hitting shit that I could peg with a thrown rock. So Crysis took a game where you snuck around in the jungle sniping chumps with your M4 to a game where you pretty much just run up and shoot them, soaking up any hits they send your way since you regenerate armor and health like a monster anyway, so there's barely any skill to it, especially with the worthless accuracy of any of the guns.
This seems to come up a lot actually. Focusing on close-range firefights made sense in Bioshock since space is clearly limited, but a lot of games with wide open areas have at most one weapon that's actually useful at long range, but you never have enough ammo to actually practice with the stupid thing, so you never use it. Farcry got away from that, and apparently the entire gaming industry thinks it's retarded for doing so.