What are the flaws? I know how to use Imp. Slam for maximum benefit and the first two tiers in the Arms tree could be swapped around for something more like 5/5 Deflection and 5/5 Iron Will. Also, I'm not stuck on Axes/ Polearms so those can go where needed.
I like to Stance Dance, especially for those quick Zerker Stances to get off and Intercept and still have some Rage left for a quick Slam.
Maybe there aren't any flaws but maybe another build works better? I've seen the popular builds of 33/28/0 or 33/25/3. Are they that much more efficient at PvP/ PvE?
Imp. Rend, move it to 5/5 Deflection, imp. rend is pretty much worthless right now, and Imp. Charge, move it to 2/5 Iron Will. Dunno if SS shouldn't be in your spec, i find it funny sometimes to kill 2 o 3 people at the same time, but maybe that's just me. Weapon Mastery is a must unless you're planning to run around with 2 weapons, and 1 of them with a chain.