Well I do agree with most of this list, besides Tom Cruise (who WAS a great actor imo). Brad Pitt is great IF he doesn't get a sterotype role for once. Samuel L Jackson IS great if they don't simply give him the tough black guy who says Motherfucker every 4 words.
But Sigourney Weaver and especially Edward Norton is just pure Oscar material.
As for Di Caprio, I heard some critics say the movie simply isn't Oscar material. Not because it's bad, on the contrary, but simply because of how the Oscars work.