Overall above average gamer - nothing to prove though, it's mainly about having fun. At the same rate, it's not so fun to play with bad players. Also, there's a reason it's rated M for mature, children.
As far as games I have (I never trade in) just ask and I probably have it if it's worth playing. For DLC, I have a large Rock Band 2 tracklist and quite a few Live Arcade games. Let me know if you want to play something. Thanks.