Didn't WotC say their goal was to make the melee and spell classes more equal? Not sure giving melee classes spells or more healing makes them equal. Now, the Barbarian is channeling powers from spirits, trees, gods. Even Rage is channeled or whatever Jeremy said it is.
I'm not sure what is so...
Believe it or not, there are people on forums who say that's stacking of advantage. Not only are you forced to use one of the worst, in my opinion, features in order to use Brutal strike. You must also make it worse. You can call it lopsided, if you like. Sadly, berserker must use this feature...