It's true, the aeonbarr warrior keeps an extra action, but as far as i understand, it is restricted to Give Orders or Rally. It does make him a better commander, but he will have issues against medium armor opponents.
Berserkers:Let's say you fight Elven Swordsmen.
Minimum berserker unit is 3 = that's 156 pts.
Elven Swordsmen for that many points = 1 Leader, 8 Swordsmen (154pts).
That's 3 wounds for each 1, but we're also talking 18 actions vs 6.
I ran that combat four times last game and the berserkers never came out on top (they did get the charge and killed a few, but it takes 1 single hit to kill them, and out of 9-10 actions, it will happen 2-3 times per turn and even more if the berzerker used their rage). One occasion they made it to cause a panic test, but it was passed. Elven Swordsmen are very generic infantry units, so i am guessing berzerkers have more specific targets? They seem to be made to kill low armor, high value units, like Black Sisters, or other Sons of Kronos, actually.
Question on Multiple Attacker Bonus: Can you claim multiple attacker bonuses if your "assisting comrade" also touches the base of another enemy? Say Swordsman A and B are both fighting a Berserker. Swordsman A attacks the Berserker. Swordsman B's base is also touching another enemy, so can he be counted for multiple combat bonus?.