get some 2d fighters. 3rd strike and the like. The Dreamcast killed it with those releases.
do you play any fighting games on xbox 360?
I have 2 dreamcasts still, great system, by the way, you can burn the games without any sort of modding to the system required at all. Probably why it died so fast.
I recommend:
RPGs:
Skies of Arcadia (great RPG)
Headhunter (really fucking cool game, kind of like a 3rd person shooter)
RE code veronica of course
D2 (kind of weird but cool)
sports:
Tennis 2k2 over virtua tennis
NBA 2k2
NHL 2k2
Tokyo Xtreme Racer 1/2 (its like a highway-racing RPG its quite addicting)
fighting games:
street fighter alpha 3
street fighter 3: 3rd strike
Guilty Gear X
King of Fighters (2k1 is the best imo)
marvel vs capcom 2
other: Unreal tournament (great 2/4player FPS)
Worms Armageddon / world party (if you dont know worms its AMAZING multiplayer turn based strategy game)