The exotics are fun for a time, but I have to say that I'm very impressed by the Nether Ray (Netherskate - Shadowmoon Valley). They are a caster nightmare. Not only that, they hold aggro very well, make dailies a breeze, and mine rarely dies.
I'm BM specced for exotics for the extra points.
Well, at least it rarely dies *now*. I still have my reservations about pets and the expansion. Especially the new large battleground where it doesn't seem any pet could survive for any length of time.
Best part ... I have the red nether ray mount, which matches the pet. I hop on my mount, my pet disappears, and it looks like I just jumped on my own pet for a ride. (ok .. so it's the little things that count sometimes too) :)