This has yet to be noted I believe, and since our guild is basically pushing to do Shade correctly, I thought I'd post it.
This is an exploit that makes for a long kill, but is an easy way to get past him.
Basically, all you need to do is get the raid to the very top of the ramp... right at the top crack. Then have someone open the door long enough to aggro shade... then just step out, and close the door.
You'd probably think that he'd reset, but he doesn't. Instead he does his normal thing, but everyonce and a while will run through the door and start attacking the raid. Just dps the crap out of him and dot him up... the dots will help keep him taking damage after he goes back through the door. Once he does his pull to do the Arcane Explosion, just those closer to the door will be pulled towards the door, but stop there, and not go through.
Just make your way back to the crack on the ramp. He still does flame wreath, so, stay still like usual. He will eventually get to the point where he polymorphs the raid... same as normal, and he will pyroblast the group, just heal up and wait for him to come through the door again.
It is likely that he will enrage, and have his shadows go nuts... but they'll never reach the raid since you are outside the door.
Same with the Water Elementals... just kill'em.
Lastly have all dots stopped at about 4%. This will save the chance that he will die inside the door. Around 4%, when he comes out again, just dps him till he's down. As long as he dies outside loot up.
There's a catch though... you gotta die in order to have him "dead". If you tried to res anybody, you'd still be "In Combat". Just open the door, and let his shadows take you out with a few waves of Arcane Missles. You can then get everybody back in and loot the rest.
We've tested this and done it several times, so we know it works... and I'm guessing will work through th4e next patch, since I haven't read about any of it yet.
Hope that helps out for any folks, just lazily going through Kara and want to try something new.