Oh yeah, I should be suggesting games now.
Marvel vs Capcom 2 is my most played Dreamcast game.
Skies of Arcadia
Grandia 2 (comes with an excellent soundtrack too, by my standards
)
I know I'm probably forgetting a game or two. But those were the best I've played. I didn't like the pace of Shenmue... maybe I'm not a SIM kinda guy (*ducks a punch from Neo*). Record of Lodoss War is a good substitute for Diablo. Maybe that's try-worthy.