Some quests I'll warn you about...

Zul'Drak has a quest that requires you to take control of an Abom, skip it. It's bugged.
Icecrown has a quest that requires you to take control of an Abom, skip it. It's bugged.
Stormpeaks has a quest that requires you to shoot harpoons at hey stacks, and there is a quest that requires you to harpoon dragon riders. Both were bugged for me.

So, skip Aboms and Harpoons.