The Operation Gnomeregan event on the Alliance side is also bugged on most realms in a very similar fashion. All it really takes is a player to aggro the mob and lure it outside of it's "comfort zone" - so you don't have to kite it far. (Right outside the village walls on Horde side for example)
This was a huge issue on the Beta/Testing Realms, but Blizzard decided to release it to the Live Realms anyways.. go figure.
"Jun'Do The Traitor" becomes immune to all forms of attacks around 50% HP. What's nice about this, though, is that you can just stand there and level up all of your weapon skills on an 80 Elite with no risk of damage. =]
You can get your [Master of Arms] and [Did Somebody Order a Knuckle Sandwich] achievements on this boss right now. Every once in a while, melee players will get thrown back by his AOE attack, but just move forwards a bit and continue attacking. Wand casters and other long range attackers can just sit back and leave their PC idle to skill up.
Blizzard Support's official solution to this bug is to "simply drag him back through the burning village." Well, that's all and good.. except for the fact that he's aggroing the NPCs and he's immune to all attacks/taunts/spells/etc. Some great QA work was done on these quests.
Below is where his approximate location is (silver arrow) by the way. I noticed that a lot of players were still hanging around the landing zone waiting for the event to start. =]
To increase skill levels more quickly, put Auto-Attack as a button, generate a little lag, and keep clicking (macros don't work unfortunately). You'll attack about 20-40% faster depending on your lag.
Also, throw on all of your haste gear, bring fast weapon types, and stock up on plenty of ammo for your guns/crossbows/etc. Shaman support is also nice for increasing melee haste.
You can get the [Knuckle Sandwich] achievement by reaching 400/400 Unarmed, and with only 3 other weapon types reaching 400/400, you'll also receive the [Master of Arms] achievement.
Get it while it's hot! Blizzard will be fixing it soon.