They still freak me out a little from the trama it induced. =)
The new shadows are pretty damn awesome. Much much better than that umbral shadows in the Necro. Hard to see, coming up flat, and then jumping up to attack, with the whispering. They are pretty awesome.
The new dragons, much larger in size, vicious and whatnot are very very awesome. Being able to talk to some of them it pretty sweet as well.
And definitely Werewolves. The animations and detail of them is really really awesome. They are way under utilized. Why Shadar-Kai assassins where picked for Mabar and not Werewolves is way beyond my comprehension. Very very poor design decision. I bet since Shadarkai or mostly responsible for the the lag, if yo0u replace them with werewolves everyone would be much more happy. Also loved their attack mechanics, my guildies and I took on the Werewolve in the shack in "A Study in Sable" and we where lining up to create a shield wall to have out caster dot the hell out of it, only to have the werewolf jump over our line and attack the caster anyway. That was super unexpected and awesome and so in character to how a werewolf would fight.