If they start dodging in and out of the doorway on Ruins, move out a bit so they are forced to come into an open area

As for the rezzing, it was one of the first major hurdles to overcome playing this setup. Usually most teams will have at max 2 rezzers, if they have 3 rezzers one of them is usually a shaman and should be the priority first kill anyways.
Basically assign a rezzer to yourself and a rezzer to your healer. So you both have one on focus target and can identify when they are casting. I also use an addon that alerts me when someone is rezzing and I always call it out on vent.
Anything that places the rezzer in combat will stop the rez - so for long range use a purge if they still have buffs, or you will need to close in and cast shocks. Sometimes they are naive enough to keep casting the rez while your loading up a Lightining Bolt / Chain Lightning combo and they die in the process.
For 3 rezzers you'll need to play baby sitter on the corpse, sadly that 85% finished movie you watched cut off the part where I showed this and explained it teehee :P
Searing totems are huge against this, since they will put them in combat, so place them around the body and spots they will usually try to rez from.