Ok, wow! I Really like this.
Feedback,
1- Currently if you wipe on the boss the enhance shaman never respawns and the gate never opens up again.
2- There's some minor texture ripping on the cave that the players enter through at the top which should be smoothed over.
3- I'd make the dragon eggs have more color to avoid them appearing textureless. I tried raising the redness up to 255 and it looked really nice. They got a very pretty glow effect which makes them look like they're glowing off the room. I'd go with that.
4- The music is extremely nice and fits perfectly.
5- The terrain is very, very nicely done. It suits the whole theme and feel quite nicely.
6- I would suggest adding a few trash pulls as sort of a "warm up" For the boss. (this would give players a few fights to get a feel for their character, too) My thought was to have four black drakes (the wow model for them has been converted, too.) flying in a large circle around the cave at different speeds. This would force the group to pull the drake into the hallway and fight them there. It would add a nice tactical edge to the boss and make things a bit tougher.
I would make the drakes very difficult enemies if you go with that route, though. With flame attacks similar to the boss and enough damage if you end up getting two at once you're almost undoubtedly going to wipe.
7- Currently I'm really not feeling the mechanics used for his adds at all. It feels like he just summons more and more whelps, and no matter what's going on they'll over run you.
I had two thoughts on that,
A, He summons a pre determined number of adds every x seconds. This way you have a better idea of what's going on and when it's going on, and prevents you having to fight huge amounts of whelps provided you're killing them.
B, same as before, except he would fly into the air for this. During his add phase lots of whelps would pour out from the sides and rush the group, meanwhile the boss would be flying in the air above the group and spitting fire down at them, and only return to the ground once all adds have been killed.
I sort of find B more interesting, myself. It would also make usage of the dragon's nice flying animations and stuff, too. They can be activated via the stormcrow flight change animations. For a reference on how to do it you could check the day of the dragon story on this site where the author used a few wow dragon models which could fly or walk.
(Theatrics aside this almost might be more fair, since when airborn his only attack would presumably blasting fire at you. Which would still hurt but prevent him from spamming his flame breath on the group while you have adds out killing you)
7- As far as the rest of the fight I can't comment yet as I've not been able to survive the huge amounts of aoe damage during the add phase.
I suck? lolz
8- The boss should reset instantly, not after 45 seconds.
Overall I'd say this map is extremely well done. I really look forward to trying to down this guy, I love dragon bosses!