EQ2Flames tend to have long, long discussions on AA tress under the respective class forums. I mainly solo, so tend to choose differently than a raider would.
I still think a berserker should not be cowering behind a buckler, which the zerker STA line is based around. If you're a tank using a shield, use a SHIELD. If not, chuck it away & use 2-hander/dual-wield ...... and breathe. /rant_over