Well, many of the first generation PSX games may suck, but I'm sure there are a few gems in there.

[Looks at shelf...]

DOOM was awesome. Best version of DOOM on a console yet. (When DOOM 3 comes out for Xbox, that hopes to be changed.)

Rayman is a fun game on any platform. Great 2D platformer.

Um.. well.. Resident Evil?? How about Destruction Derby? I played the PC version and it was great smashing things.

Some might argue Jumping Flash kicks booty. (Don't have it, but I hear good things.)