I totally agree with you regarding PVP.

In fact just the other day, on my mage, I fought a 3 box frost mage group at SP. First time through they killed me with ae spam, but after that it was really easy to break them up. It has to be 10 times easier to kill my group then it was fighting them.

On a different note, I'd hate to try to tank any of the 70 dungeon bosses without a warrior, paly, druid tankish. So i guess it really depends on what you're planning on doing.