What this game needs is more missions where W/Mo's will finally learn how to play the game. Otherwise, more and more people will keep playing with heroes.
The best mission in Nightfall is Moddock's Crevice. By far. This mission, like no other i've seen so far on all 3 continents, proves how bad (sorry, horrible) an average PUG is. But moreover, it teaches. Hopefully, eventually players who pass it with masters will learn. Unfortunately some requirements which are needed to get masters on this mission, should be standard requirements to even pass the mission. Lemme explain further what i mean.
Runners. Oh yes. Stopping 2 runners. For a PvPer this is a joke. Really. For PvErs, this is incredibly strange concept. Snares in PvE? A what? What is a snare? One feels like in RA when WMo chases you shouting "stand still u noob". Your group can have four melee players, and they might, just might, cripple one runner.
I dont like playing with heroes all the time, but honestly, if no friend or guildie is online, im forced to. Simple tasks which even heroes can do (disable non-cripple skills, give em target), seem to be such an obstacle for PUGs, that it's really not even amusing to fail so many missions.
/rant off
