Matt Damon is a leftie too, but he's an excellent actor, not afraid to do "small" quality movies. The others in Oceans are just pretty faces. And getting less pretty every day. Brad Pitt has had so much "work" to keep that baby face that he'll never be able to tackle grown-up roles convincingly. ButI think Damon will age appropriately and be around for decades. His pal Affleck, the prettier boy in Good Will Hunting, has already past his peak.
Ever see Snatch? Pitt does everything he can to ugly himself up for the role. Same can be said for Kalifornia. Pitt's actually cursed with being too good looking. He's an exceptional actors who's too often dismissed as a pretty boy.