dreamcast was and is awesome, i got one with 4 controllers and a ton of games and 2 vmus as a pay for TSOP flashing an xbox, gave that to my gf, shes now addicted to super puzzle fighter
other great games:
Sonic Adventure: best sonic game EVER! may not look as good as heroes, but when it came out it was absolutely BEAUTIFUL, and its still the most fun to play
Crazy Taxi 1+2: who would have thought being a taxi driver would be so addicting? add in a kick ass soundtrack (offspring, bad religion, methods of mayhem) and you have one great game
Resident Evil: Code Veronica: even sony fanboys agree this was the best RE game ever made (this was before it was put on ps2)
Ikaruga: play it and youll understand
Omikron: Nomad Soul: i picked this up in the 5 dollar bin at best buy when it was new, i have yet to figure out why it was in there, its alot of fun, being able to steal peoples bodies is always a plus, lol
House of the Dead 2: the game light guns were made for
Hydro Thunder: boat racing, although whenever i play with friends we never race, we just ram each other while boosting
KISS: Psycho Circus: surprisingly this is actually a pretty good FPS, with a cool storyline
Star Wars: Demolition: ok, maybe lordvader129 is a bit biased, but if you like twisted metal chances are youll like this
Armada: kindof an RPG/shooter, the sheer size of the playing field is a testment to the DCs power
ill probably think of more great games when i get home and pick over my pile, lol