they will snare, dot, etc.. very annoying for the puller in the group. If you don't have a FD puller or if you don't have a mage in the group for CoH, get ready to run out to your puller or they'll get spanked while trying to get back to camp if they get snared.
I pulled these succesfully for about 10 hours with Cancel Magic one night as 56/57 paladin, dinged 57 there. Next time I went back a monk insisted on pulling, we got spanked. FD pull just doesn't work in places where most of the mobs harm touch.