The one time I did, I used a spell that makes them attack all nearby things, only to find out that I was the nearest thing. 
Illusion is a very,very powerful spell line. If you combine it with sneak and alteration ..and either archery or destruction you're practically Loki incarnate.
I have been able to clean out dungeons filled with things that would 1-shot me in melee thanks to the Rage spell. The quest in Solitude to clean out the wolf cave is rather hard for a non-melee. There's tons of high difficulty wraiths and dragurs (sp?) as well as a swarm of casters in the castle area (3 towers and the area between them). The 'boss' casters are on top of the highest tower and they're a good 5 or so levels above you.
You enter the area of the cave where the castle is (yes..a castle underground.. Skyrim is weird) from a grotto that is almost at eye level with the highest tower. You can see the boss casters up there. If you snipe one with bow or fireball the rest aggro you and by default, aggro the entire castle on you and everything in between.
But.. one overcharged Fury spell ... hits one of the bosses... and its popcorn time. (Rage spells doesn't reveal your location like arrows or destruction spells do.. it barely gives them a vector to you so its very hard to be detected by casting these.)
You get to see the place light up in fireballs/lightning as the bosses kill each other and then run down to kill the rest of the castle defenders. The boss dies to the swarm, but when it does so you just pop him a raise dead spell and you get to watch him go bonkers all over again. When he dies second time he's dust... and you got tons of corpses in plain sight you can just raise from afar and watch them clean the place for you. You then simply walk in, take out any stragglers and claim the loot. I finished that quest in about 15 minutes. If i had gone in killing the place myself it would've been almost impossible as those high level critters kill me in 1 shot.
I think I have a save game in that spot just before I did it.. i'll see if i can fraps the whole thing and post it.