World PvP is a lot more fun at high levels. My warlock is 59 now, and I'm reasonably confident I can put up a fight now. I still don't bother attacking people, but at least I can defend myself against most would-be gankers.
I was questing in Andorhal in Western Plaguelands, and a level 60 dwarf priest attacked me for some reason. He started casting spells, I started DOTs and fearing. Eventually he gave up and decided to run. I chased him all the way across the map, up to the Hearthglen Lumber Mill, before finally killing him. Good times.