In my opinion, Barbarians in BG3 would be much more fun to play if we fix their bonus action economy problem:
Scenario: You run into a cutscene, with a Barbarian follower lagging behind. Combat ensues.
The Barbarian is a bit behind. Being a strength based melee character, they have a good jump distance. They want to run and jump into combat, rage, and attack!
1. In BG3 for some reason jump requires a bonus action in addition to movement. If you had to jump into combat, you'll only rage on 2nd turn. (can be circumvented by switching to Barb during the cutscene and moving into position, but that's no fun! part of the barbarian power fantasy is just raging in and jumping!
2. Rage then requires a 2nd bonus action.
3. Then if you're a berserker, on the turn you raged, you cant get the extra attack, as that's yet another bonus action. So the berserker doesn't get that extra attack on that most important first(if you jumped, 2nd) turn of combat.
4. As a strength based character in melee range with enemies, the bonus action is really useful for shoving. Can't do that on the turn where you jumped in, raged or berserker extra attacked.
5. On hard fights, it's really helpful to attack with your action, then drink a healing potion on your bonus action. Can't do that on the turn where you jumped in, raged or berserker extra attacked.
So my suggestion for a fix is a buff for Barbarians in general and Berserkers in particular:
A. Make raging cost no bonus action. This is not what happens in dnd5e, but with other changes from 5e, this enables Barbarians to use the tools other classes can, making them feel less gimped on the first raging turn. Since it still consumes a rage charge, I see no problem with this.
B. Give Berserker an extra attack instead of a bonus-action attack. They'll get the extra attack while raging as part of their action and be able to use the bonus action for other fun stuff. Also if hasted they'll get to be super-powerful just like fighters and casters, instead of being left behind on the overpowered multiple action bonanza.
C. Remove the bonus action cost of jump. No need for it. Jump costs movement.
