Although I'm tempted to suggest there's something horribly wrong with you if don't find Bioshock interesting, if you're looking for good upcoming games for the 360, I suggest the Leipzig Games Convention 2008.
The show just finished and there's great video coverage of everything 360
here. Left 4 Dead, Far Cry 2, Mirror's Edge, Red Alert 3, Dead Space, Bionic Commando, the new Call of Duty and Fallout 3 immediately spring to mind but there's other good stuff too.
As for games already out, have you tried Orange Box? On XBLA, I love Rez, Bionic Commando Rearmed, Castle Crashers, Braid and Ikaruga at the moment.
Hope that's useful.