I just hammered the shit out of a rogue/hunter combo tonight that were trying to gank me in Zangarmarsh (I'm 63). Basically, I didn't even have to drop totems.

They popped on me and started attacking. It was like so:

lightning bolt
EM+CL
SHOCKOMG (dead hunter)
chain heal x5
lightning bolt
lightning bolt
CL
SHOCKOMG
chain heal
lightning bolt
lightning bolt
SHOCKOMG (dead rogue)

Throw in a couple of fire nova totems if the rogue vanishes. Also, lesser healing wave the person the rogue is beating on if he uses Cloak of Skillz.