I'd recommend a paladin or DK also, simply for the fact that they have a nice aoe that lays on the ground and grabs adds.

There are many instances in the expansion where adds will come out and you need to grab them. Trying to time a thunderclap or other aoe on a warrior or druid to grab the adds is a chore. With a paladin or DK you just throw down your aoe, they run through it and insta-aggro on your tank.

No more worrying about them running straight to your clothies or (in the case of violet hold) running past your group and damaging the thing you are supposed to be protecting.

That's honestly my only complaint with my warrior - he holds aggro well and does a good job (spell interrupts are nice as well), but dealing with adds that walk past him is a pita.