>>723192163
That ability is only usable when you're enraged. But late game Giant Barbs have like 4-5 enrages per long rest, so it's not a huge deal.
>>723193526
I'm doing a run where Karlach is a giant throwing barbarian (10 barb / 2 fighter) and she just shits out damage while being extremely tanky. Easily gets 4-5 attacks per turn (not even counting bonus actions like the giant kick or the bonus action throw that functions exactly the same like a regular throw) and that's not even using the fighter ability that gives you another action in a turn. Only character that even comes close to her in my party is my MC.