I'm not sure if I've retired a barbarian, but I've certainly decided not to play one.
For me the problem is that the mechanics don't support the story I expect.
I see barbarian and rages, I think of an aggressive damage dealer who can also handle taking a beating.
My problem is that in my experience the barbarians are damage sponges that don't really ever do noteworthy amounts of damage without the great weapon master feat.
A paladin with smites have large spikes with lots of damage that feel good, and with high AC they can also take care of lots of incoming damage.
Both fighters and barbarians also come with a lack of intrinsic support for out-of-combat situations. Other classes have spells, charisma or class features that really help out of combat. Barbarians and fighters get situational ribbons.
I'm not saying that barbarians or fighters can't be fun to play, but they require more work in terms of making a backstory to compensate.
For me the problem is that the mechanics don't support the story I expect.
I see barbarian and rages, I think of an aggressive damage dealer who can also handle taking a beating.
My problem is that in my experience the barbarians are damage sponges that don't really ever do noteworthy amounts of damage without the great weapon master feat.
A paladin with smites have large spikes with lots of damage that feel good, and with high AC they can also take care of lots of incoming damage.
Both fighters and barbarians also come with a lack of intrinsic support for out-of-combat situations. Other classes have spells, charisma or class features that really help out of combat. Barbarians and fighters get situational ribbons.
I'm not saying that barbarians or fighters can't be fun to play, but they require more work in terms of making a backstory to compensate.