Horwath
Legend
thinking rage is complicated is because it was written poorly and split with reckless attack needlessly.Barbarian is not the simple class like fighter is. It is fairly simply, and I agree most of its subclasses are comparatively simpler than the fighter subclasses in general. But I've seen more confusion over using Rage correctly, for example, than I have with any core figter feature. Barbarians also have more features to learn and keep track of.
But, that is just my experience with the two.
How I combine rage and reckless attack in one(then you leave lvl2 barbarian for fighting style) and combine bear totem as default so 90% of barbarians are not Bear totem:
Rage:
at the start of your turn(free action) you can chose to rage:
Rage:
resistance to all damage,
all attacks vs you have advantage
advantage on all attacks, checks and saves based on STR and CON
damage bonus equal to barbarian table
cannot cast on concentrate on spells.