Sorry if that has already been said but I believe many people look at the increased stats as the capstone of the barbarian and think that pretty good. What the true capstone of the barbarian is the infinite rages which when combined with the level 15 ability to maintain rages unless unconscious makes for a truly frightening force of arms that seems nigh unstoppable. Add in the stat increase for a truly epic level 20 power increase unmatched by any class in the game. If barbarian does what you like then the level 20 barbarian does it even better.