I've never played one either. I don't think I've been in any pen and paper games where they were even allowed.
So, I guess that limits my playing one, but I wouldn't have chosen it any way.
I've always operated under the rule that being a barbarian is like being any other nationality, like a Thayan or Cormyrian. Perhaps the best known barbarian in the Forgotten Realms is Wulfgar who was raised a barbarian, but had the class of fighter.