I'm not anti-Nintendo. Hell, I still have over 130 NES games. I have every system Nintendo has made along with plenty of games for each. I still play my GC just not as much. I enjoy the relationships I have made via X-Box live. The human element is really cool with the live play. At the same time I can't stop playing Return to Castle Wolfenstein off line. That game really rocks.
My favorite GC game has to be Resident Evil 0. What a fun game.