[Spitty]

Who says there's a cleric?

Wait-to-assist is appropriate for hard targets where aggro is a major concern.

In my opinion and extensive, board-certified experience, waiting to engage on group mobs is silly and inefficient.

If your rogue or monk doesn't know how to manage their aggro properly, let their asses take a couple hits. They'll either figure it out, or you can take turns teabagging the corpse.

I habitually slow shit immediately, but I stand by the MT and make sure if/when I catch aggro, I'm not screwing things up. Couple rounds later I'm off top aggro and the mob's already at 60%. Efficiency.