Shenmue 3 (haha)
Someone else mentioned Sonic and Sega All-Stars Racing. YES to that.
A lot of fighting games (especially VF5)
The original Call of Duty (I'll be honest; I loved that game, aside from them ripping off "Enemy at the Gates" which was a crap movie)
Ridge Racer 5
And more stuff, probably. Everything. I wish everything had a Dreamcast version. The world would be a better place to live.