I would be leveling 5 at the same time. Once they get to 80, depending on if I like them, they would take over Tank duties of my team... or as an off-tank. Depends on how much they rely on melee or range for their DPS.

Rezzing ghouls should be interesting along with multiple AOE DOT with possible fears... multiple diseases increasing damage based on how many diseases are on the mob...

I'm guessing that DK will be OP for a little bit... so I plan on maximizing on it.