I found low level barb to be quite easy. Here’s my advice: At low levels for barb, use lunging strike as your basic attack, and death blow.

The need for lunging strike at low levels is obvious. At low levels when you don’t have a lot of movement speed and struggle to keep up berserking, lunging strike helps close the gap by literally lunging you at the enemy. It basically makes up for the low movement speed. You can’t do any damage if you can’t reach the enemy, and lunging strike helps fix that.

Death blow is an AOE attack with a 15 second cooldown that has the cooldown reset if you kill an enemy with it. So you need to optimize killing blow by never having it on cooldown. You’ll find out pretty quickly when an enemy is low enough that you can death blow them. With “warriors death blow” you gain berserking for 3 seconds whenever you damage an enemy with death blow, so it helps you keep up berserking. There’s also items that give death blow extra charges, there’s a unique item called overkill that turns it into a bigger AOE attack. It’s quite strong.