I'm playing and enjoying the Necro. I do notice that I'm slower at killing mobs than some other classes (I've seen dudes with massive swords run up and demolish mobs) but I don't mind as my character (Faluzure) is so themed towards necromancy that I can't really imagine playing something else. Sure, if the class reaches a point where it's totally unplayable (and people are refusing to group with me despite me being a good player) then I'd consider a reroll. I don't think Arenanet would let it get to that though. They have no reason why they would let one class fall flat on its face.
I'm going to remain patient and see if things improve. I don't do much pvp, so in the strictest sense, class balance isn't a major threat to my enjoyment of the game. My current support build is really awesome (nearly OP) that I really have no issues with the game.