Goddamit Curl, you missed some amazing gems on the way! Bolded are (imo) the must-have ones.
· Catherine, if you want a meta-narrative game about infidelity, love and killer babies.
· Fallout 3/New Vegas, to satisfy that post-apocaliptic RPG need.
· Fable 2, quite possibly one of the greatest light-hearted RPGs out there.
· Dead Rising; even if you don't really enjoy slashing hordes of zombies, this game brings a lot of elements to make it fun, plus an interesting (really, interesting) story for a zombie-based game. It's also one of my favourite 360 games, and I really recommend this one.
· Geometry Wars 2. You might not be into indie/arcade based games, but this one is damn worth it for the fun alone.
· Shadow Complex, for that Metroidvania feel. There's no Metroid nor Castlevania here, but this will suffice, I hope. xD
· The Evil Within, for a nice throwback on japanese action horror. Another one of my favourite 360 games, although I could understand people not liking this one.
· Dark Souls. But if you don't like these kind of games, then go for Kingdoms of Amalur/Oblivion.
· Dragon's Dogma. One of Capcom's best games ever in history.
· Lost Odyssey. For that craving JRPG goodness.
· Nier. Father/daughter stories are always nice.
· Sleeping Dogs. Like GTA, but if you didn't like GTA, I think you could love this one. Just give it a chance.
I'll think of more later, but I think those are a good bunch for now. :P
