DK+4xPallies may very well be the next uber-team in terms of survivability. Healing Hands x 4... Could be fantastic...

Druids are going to need to be played strategically making use of stealth to pick good fights and then return to the shadows.

Locks are just too squishy. Pets are nice, but people don't have a hard time closing with anyone. You can freaking mount up and ride into the middle of anyone, really. A whirlwinding warrior will be a huge problem for you.

It was said earlier... it's true. 2-3 melee classes at once will be a real problem for you, even if you tote along your own healer. Most folks don't multibox so they can be beaten in a 3 on 5 situation.