rohn

A few more tips I have noticed that help me playin it on hard (PC)...
 
Positioning- get your melee behind them, and make sure they don't get behind you. I'm not sure if its an auto crit for backstabs, but it at least makes it crit a lot more. I'll have my tank gather 3-4 and back to a wall so he can't get surrounded.
 
I messed up my tank by thinking I should put most of my points in con. Get Str up for the better armor.
 
Tough groups you can sometimes cheese through em by pulling with your rogue. I did this with the reavant before i realized ser whatshismane was sitting at the gate lol. You'll usually only get a couple of the group and you can pull them around a corner, through your traps ect where they are easy to deal with.