I agree as to it being Ray Liotta's movie. He was the main character and did a damn good job. But that's where my agreeing ends. I think Pesci spawned the performance that stole the movie... Well, not as far as stealing, but certainly caught your attention when he's in a scene. He's vicous, hilarious, and loud... That's the kind of character everyone wants to see! Well, alot of people, at least.
I think De Niro and Pesci's roles were better in GoodFellas than Casino. I mean, Casino is an AWESOME movie, and one of my favorites... But, just because the role was bigger, and you got more into their minds, doesn't mean the acting's better. I think their performances in GoodFellas is slightly better.