learn to play... seriously. Other groups are doing the combos just fine. So its not the game, its you.

position requirements arent too restrictive. It should be possible to screw up the combo, otherwise all you got in the update was a damage boost instead of a combat system.

The only reason that archers do not have positional requirements is due to the radial distance between them and the target would cause them to run very far to get into the proper position with the risk of an enemy turning, or dieing before they could get there. Unless your silly enough to be locked on a target, melees do not have this issue. they can get to the correct side in a second or less.

Shoot, even while tanking on Glad I can pull off the combo that starts from behind without turning a mob... solo.

I am sorry if you are having issues, but the problem isnt the battle system.