also how well does marvel vs capcom 1 and 2 look on the sega dreamcast do they look arcade perfect?

I'd say they look pretty close to the arcade.

But don't worry about the graphics, worry about the gameplay :P If your heavily used to the arcade version, then it may feel a bit odd at first when playing with the DreamCast controller but after a while you should get used to it.

my money goes on 2, teamplay and more characters. defiantly worth the money u pay.

I think marvel vs capcom 2. The continue of a game is sure better...(well, rare but it's true)