MW 2, the co-op was entertaining but the rest of the game was shit. 'Nuff said.
Splinter Cell: Convinction, this game was an absolute joke and a big slap in the face to the series. The worst part is that people loved this stupid game because it wasn't like the previous ones. The game takes very little skill or stealth ability. You're pretty much encouraged to just blow everyone away, and because of your ridiculous arsenal, that's completely doable. I also really hated how you were either completely visible like a neon sign, or as invisible as a ghost. And the worst atrocity that this game makes, in my humble opinion, was the fact that you didn't have your night vision goggles or thermal goggle. Yeah you had that stupid sonic emitter thingy, but that's just not the same. I couldn't even finish it, that's how lame I thought it was.
Too Human, I thought the makers of Eternal Darkness and the people who brought one of my favorite games of all time, Metal Gear Solid, to the Gamecube would have been able to make a halfway decent game. Boy was I sadly mistaken. The plot was idiotic, the combat was wonky and boring, and there was practically no penalty for dying which makes progression less appealing. At least I sold it off for $45 afterwards, so I didn't get completely screwed.
There have been others, but these are the ones from recent memory.