Not enough people loved Onechanbara: Bikini Zombie Slayers on Wii. It's a sequel Onechanbara: Bikini Samurai Squad on Xbox 360. Never tried the 360 game, but on Wii its is an EXCELLENT hack and slash, with 2 characters, 2 more unlockable, a lot of custumes and well implemented motion-controlled combat!
I also like Breakdown on XBOX. It a unique FPS and for being made in 2003, it's more realistic than more modern FPS games. I mean, I can look down and actually see my feet! It also has a unique combat system, utilizing auto-aim when using a gun, and a complex hand to hand combat system, involving punches, kicks and combos. Really fun, and one of the only FPS games I really like.
Army of Two is also an incredible shooter. I love the team-based gameplay, and the characters are fun to play as, although I prefer Salem over Rios. I'm not one for shooters, but I tried this at my aunt's, on her boyfriend's PS3, and we loved every second of it. I found it later at Walmart for $20, and was easily a great purchase. I can't speak for the single player experience, as I never tried, but the multiplayer is AMAZING!
Fable II is also an awesome RPG. It's funny, has nice character customization, and has a decently sized world. I like the gameplay as well. Simple, yet fun! I'll happily take it over the borefest that was The Elder Scrolls IV: Oblivion, anyday.