I have been contimplating the exact same thing

I love Hunters almost as much as i love Warlocks

From my experience Hunters do have more survivability than warlocks but its mainly done via run shoot run kite wing clip trap etc etc etc

it works great but with slaves you cannot really control them well enough to pull this sort of annoyance off

thats where warlock slaves shine.

Tab Dot Tab Dot AoE fear Tab dot. through in SoC etc and gets pretty dam annoying fast