I got a 360 as well about two months ago. I bought nine games total... all the best reviewed greats. I even downloaded the Halo 3 demo (really, really sucked... control issues, weapon feedback sucked, generic feeling weapons, bad graphics, bad gameplay, etc). I just couldn't get into it. I like guitar hero 2 and played crackdown and gears of war for about a couple of hours each and that's about it. The rest seemed kind of "kiddish." The controls just didn't do it and most nights I fell asleep with the controller in my hand on my recliner. I can honestly say I've never done that PC gaming.
Needless to say, I sold the system about two weeks ago. $700 for guitar hero just wasn't worth it for me. Still keeping my Wii though

Mario Party 8 and Zelda still lure me to that one