My barbarian, lvl 77, uses another barbarian. Coz i thought it would create a good backup and to lessen time killing strong enemy. Currently, my merc barb uses Bz Zhy Wang unique sword but his base damage isnt high

I thought by casting Battle Command (increases lvl), would add to his damage. But it didnt, just that he has auras under his feet. Nothing happens.
My Paladin has been so successful with the desert warrior. I choose, defiance. With the help from fanaticsm, my merc does 1000+ damage which is so good. Its very fun playing along with them. Just that he doesnt really care about his own situation but most likely love to jump into hordes of enemies.
Just a little thought that in D3, there is a button command to let them know when to fall back and when to "storm the front"
The other characters ive created, they uses:
1. Druid - Ice Rogue; since he can summon his own companion and doesnt have long range attack.
2. Necro - Fire Rogue;I choose fire rogue, not the cold ones. Coz, it doesnt matter

3. Assassin - Sand warrior Defensive; need her defence up.
4. Sorcerer - Barbarian;a FAQ ive read, he advises to use the sand warrior due to sorc defence she has. I didnt put any points to dex. It wasnt helping enough using the 2nd act merc, so i choose barb for a max physical damage.
5. Rogue - sand warrior Offensive;Needs her attack rating up as much. Yes in Nightmare, she would do a very nice damage with the Might.
I dont really know whether these merc are well enough for my chars though but im sitting comfortably so far.