i think it has a lot to do with playstyle, barbs have to learn to adapt
i agree with euro that neither me or nofear are at vimer's level for example.
i do have more ehp than nofear and that helps, and i can go a lot higher on ehp.
vimer for ex has more dps, but 1 crit of mine does already more than 50% damage to mokkal, so if vimer has around 10-15% more damage on crit (with similar ehp to mine, from what i've seen so far, although he has a lot of gearing options) he would need roughly the same number of crits, although he has more cc, which again is debatable because many of the hota shots are done at full fury after a stun for example, so the cc diference is not that big.
but a lot has to do with running around corners and breaking line of sight, barbs can no longer face tank wizzards, they have to play smart, if i just stay and get 2-3 stuns in a row i'm dead but if i run around corners, hota after charge and run before stun i sometimes can make it work.
i really want to see the result of vimer vs mokkal (who is so far the best wizard in d3cl, at least vs barbs). if vimer defeats him than the matchup is perfectly fine and it means other barbs are undergeared.
i dont think any bans are required now, but if mokkal defeats all barbs (including vimer) 5-0 than something could be tweaked afterwards.