Ok this is hand down my GOTY so far and I doubt it will be topped by anything else.
I've played so much of this game in such a short lapse of time that I can barely believe it myself. I love my barbarian. He's a killing machine when I want to, or a "against the odds" survival beast. First I was going all out dps, with a pure dps build I've found experimenting. Then I was looking for maximum +dmg and strength. From what I've gathered, dual wield gives extra damage, which is contrary to what I've read in this topic many pages back. I was pure destruction incarnate.
Needless to say, I was Barbarian "the quick bringer of quick death". Everything in my passage was out in only a hit or 2. Multiple mobs? Pffff. I hit so fast with frenzy that everything dies just as fast as an AOE skill. Harder packs? Pop out Earthquake and switch to cleave if necessary. Even Nightmare was a cakewalk save for 2 fights. People were constantly telling me how awesome I was, that I was making this all a breeze, that they loved how quick the progression was, that my dps was unbelievable.
But then something happened...
I've started playing Hell. At only 9k hp at the beginning, I was one shotted by elites. Normal mobs were a threat if not killed a bit separated, and really, all the elemental damages the mobs and elites were doing made it unplayable for my pathetic low hp character. I've also read how melee were supposedly weak in Hell and Inferno and that discouraged me a bit. So I've started purchasing vitality gear and changed my spec to something more defensive and survivalist. The fun is back! With 43k hp and offensive/survivalist gear, I am nearly invincible even in the most unlikely situation. I simply tank all the elites and survive all their elemental and physical damages. Hell is quite a bit easier with a tank because everyone else simply have to avoid the environment damage, which already do enough damage like it is (damn blue spinning orbs).
So far in Act II, nearly done with it. I really can't wait for Inferno. I've heard it treats you horribly.