I tried, I really, really tried but every warrior-type build I tried to put together would always derail away from the Barbarian and go Ranger/Fighter instead. It's the Rage mechanic! I can't stand the whole gain HPs and lose them after the rage ends, don't want to play a warrior who needs a Cleric-IV stat everytime a battle ends...if you're going to give temp HPs then give temp HPs, don't dangle them out there and take them away bah!
I have and will play any other class (favs are wizard, fighter, and rogue), straight-up or multi-classed, though I refuse to ever play a multi-classed caster. Full-caster progression is far too powerful/important compared to alternative abilities gained from PrCs or multiclasses that delay caster progression.