Barb's shtick is only Carnage and transfering the on-hit/crit properties.
Barb in PoE1 is perfect for fighting big crowds, not good as single target damage dealer like Rogue
That's where the whole pointlessness of the class becomes evident. The moment he gets surrounded to "fight a crowd" he gets KO'd.
The Barbarian is a class which starts with the second lowest deflection (15) and the second lowest accuracy (25). It is expected to prioritize Might, Constitution, Dexterity and Intellect at the same time. There are more gaps here than you can fill with attribute points. It's a seriously underbaked concept of a class IMO. You can hardly benefit from Carnage because it's not durable. The high health pool cannot compensate for the low defense stat in the way it compensates for a fighter.
Edit: Sure, like everything else in this [insert adjective] game, it's not unplayable. You can make it through the game, you can build him in a way that makes you feel some kind of progression. Yet there are simply more optimal, less micro-intensive ways to achieve the same effect. Tank with a fighter - hit with a wizard.
But if you insist to bang your head with a barbarian who "tanks" and deals piss-low damage for a couple of rounds before he most probably falls, because that's how you want to "express your character" as Josh imagines it, then that's you.