Been playing for a while and this is my third post.
IMHO dual wielding is the only worthwhile style/spec as of V0.7.1 as the damage potential far outstrips any of the other styles as they stand(especially with the critical damage aside from mobs with crit resistance)
The only things I would change about it is to move away from percentages based off of the weapons base stats to flat bonuses for the specialization skill (I think the style perks are perfect the way they are) I:e;
1: instead of adding +50% to AC and BC based off the weapon stats it should be +15% AC and BC flat with perhaps either +3dmg or +5 crit
AND