As someone who likes the lore and feeling of playing a barbarian, I have to say I agree with the issues posted so far about the class.
The fighter should be a better tank: This is achieved in spades.
The barbarian should have higher dps rate: this largely isn't. Certainly not in the harder fights in the game (dragons, ogres, bosses)
Of course, with any semblance of balance, the barbarian would have the potential for higher single-target damage, too, because he's incapable of tanking.
Nevermind the huge gulf in defences, and the fact that the fighter essentially gets heavier armor for free twice (through talents and less attribute dependency)
A frontline barbarian should not just be a rogue with muscles. Not precisely on topic, but I'd really love if the game provided for an OP barbarian. As it stands, not so much.