There are TWO Brad Pitts. The clean-shaven, boyish Brad of "Meet Joe Black" and the evil twin Brad Pitt in "Kalifornia" and "Legends of the Fall"'s WWI berserker scene and Jeffrey Goines in "Twelve Monkeys".
I think he does evil twin pretty well. The only good scene in the silly movie "Troy" IMHO is where Brad, as Achilles, runs across the battle field and cuts down his over-confident, giant opponent.