The barbarian sucks giant balls at low levels. It’s clunky, it’s slower than everything else due to being melee-only, fury generators don’t generate enough fury or do enough damage, on and on…
Once you hit level 50+, the barbarian starts to turn into A BARBARIAN. You’re not fury-starved anymore, you have enough HP to take hits while you round up enemies and cleave them down (I’m playing rend + maelstrom), you can blast through packs just as fast as other classes, and it’s generally a WAY better feeling class to play.
Just dump everything into flay, thorns, and shouts, in that order, until level 25 or 30. Then respec into lunging strike with bleed with all the shouts, iron skin, and zerker upgrades. Enjoy never dying and watching the waves of demons punch themselves in the face to death.