Hey folks,
I just wanted to add a couple things here. I read every post and I don't think this has been mentioned yet. There are a ton of "builds" given here and clearly you people know your game, but unless I missed it, nobody has yet mentioned pure flavor.
Some people play barbarians because they want to be a barbarian. Someone mentioned them as "agents of chaos" and that's the closest I believe anyone came to saying: "Hey, barbarians are very different from fighters in the way they operate and I like it."
Now I am a little old school and I understand that a lot of game theory has changed with the advent of MMOs. Words like "build," "tweak," etc. did not used to ever be uttered. It was simply: "I wanna be like Conan or Harald Hadrada."
Please don't think I am saying that there is anything wrong with knowing your rules and crunching the numbers, but also keep in mind that some people play what they play so there is a cool party dynamic, not just the "best" stat sheet.
I think PF's barbarian does just that. Do I agree that some of the Rage Powers seem useless: yes I do- I laughed out loud when I read "Raging Swimmer." However, my wife plays a dwarf barbarian in our game and not only does she dominate combat, but she has a really good time doing it. Her catch phrase before going berserk is: "I AM A FIST OF RAGE!" And that's just good times at the table.
Anyway, just thought I would throw in the fuddy-duddy approach and say that barbarians are good at what they do, I think. More than enough reason to play them if someone wants to play that type of character.