In your Opinion:

Let's open this by saying you are all around the same level.

What is the worst toon you want to come up against (in PvP) ?

Even if you outnumber them - say 3 to 1 - you know that you are in for a fight and one of your teamates ain't gonna make it to the end.

Who do you have no problems with facing one on one?

Hardest to beat is probably a mage, especially if you are NOT ranged. With my 60 mage, I could take multiple people out. I would either sheep or frost nova them. Then blast away. Once they broke free, I would blink away and then cast spells again. They really could not hit me at all, unless they were ranged. I died to hunters a ton...

With my 60 mage, I had no problems beating most everyone 1 on 1. However, a hunter and warlock were the hardest to kill. Sometimes beating a druid and priest is hard too, just because they can keep healing themselves.