I LOVE MCR! I have been a fan of them for almost 2 years. I really like the song I'm Not Okay (I Promise) and the whole Black Parade album.
I don't want to totally "geek out" on y'all, but some of their songs will be on Guitar Hero 2 and/or 3 for the 360 or PS3 or somthin' like that, which is AWESOME! Sorry about that geek out, I tend to do that sometimes. Anyways, I can't decide if I like Fall Out Boy more though.