Barbarian - Too many skills improving armor, but armor is useless if you have no resistence. Maybe change a skill to improve resistence instead of armor?
Berserker - Even with Barbarian having many armor skills, he is too two-handed focused, that means, he can tank a bit but will never be a true tank, that said, could you add a taunt skill to berserkers? Im making a berserker tank and its just my favorite build all the way. The only thing to add is something to aggro the monsters to him so multiplayer will be more fun. Could even replace that chain skill with something to aggro, since that skill (imo) is kinda useless.