Yea the VW is a pimp in the lower level instances.
After hes rounded them all up, hit the AOE taunt deal he does. then start the SOC spamming.
If a mob peels and runs towards you, send the VW after the mob running towards you- that way your mobs stay clumped.
I generally have him run around picking all the melee mobs up, then park him on the group of casters- as they dont chase very well.
I sit at 1160 spell damage and 26% crit, Felguard spec'd because I'm too lazy and cheap to spec into something more grind friendly.

I loved doing it this way in SM, and DM. I could do the Cathedral in 3 pulls with a bit of practice.