I like some of these builds! Just glad to see something other than whirlwind for a change =)
I do like the Seismic Slam oriented stuff, but it feels odd to me. It certainly fits better with a Weapon Throw based build due to its excellent range. I think I want it to be somewhere between Hammer and Seismic Slam range, minus the knockback and it'd be awesome. Seismic slam feels a little too ranged for a melee build and HotA is a bit too small of a range to really accomplish much AoE. I have tried the Rolling Thunder, I found it a bit hard to aim very well, but that may just be me. Felt a little underwhelming.
I've been using this:http://us.battle.net/d3/en/calculator/barbarian#aZQXcR!YgZ!ZYZcZa
It is pretty enjoyable really! Thunderstike isn't anything new to anyone, but it is pretty fun when you get em chaining together. I only run this on mp 1-3 right now, just playing around and picking up scraps for my still pretty poorly geared Barbarian.
I'm not terribly sold on Rend: Bloodlust in the build currently. Sometimes when I really need some life regen badly, it is a total lifesaver. When I'm not really in a big life need, it feels pretty useless. One thing I really dislike about Rend in general is the very slow/unresponsive cast animation. HotA is super fast in comparison.
Just not real sure what I'd like in its place though. Revenge would give me another fast firing close range AoE, but with how much stun you pump out with this, not exactly getting hit very frequently.
Really just needing a bit more DPS overall, not sure if that is entirely due to the skill setup or my severe lack of gear (probably gear).
Thinking about WotB in that spot but I'm not a huge fan of it either. Not that it is overused and tired necessarily, I just don't terribly like skills that do nothing for large chunks of time (hence why I'm looking for a replacement for Rend that I don't use much.
Any ideas are welcome, and feel free to toss out any more odd builds that you like to toy with on lower MP just for fun and not for power-grinding massive efficiency, there are a million other threads for that =)