Brad Pitt can be a GREAT actor...when he gives a shit. Save for maybe FIGHT CLUB (where his natural charisma is used to sell his character) and 12 MONKEYS, he usually coasts like hell (apparently, Pitt rather be a movie star than an actor.)

Edward Norton is a great actor, and probably will be noted in decades to come as one of the best of our present times. Thankfully, after a lengthy vacation from movies, he's come back, albeit in either short but brilliant performances (KINGDOM OF HEAVEN) or that in very small movies that is of his own crafting, and apparently disapear as suddenly as they reach theaters.