He really isn't. His defensive stats are pretty low and even a single range unit can deal serious damage to him before he becomes a real threat.
I know he is suppose to play more of a support roll for his army than the POB does but currently the low unit count of Wolves means you usually only have a single unit taking advantage of that.
It could come down to how I played him but swapping him for the POB was like night and day for competitiveness.
My easiest fix for the Worg was a speed bump but that has a fair danger to it. It really isn't the way I think it should be done.