I agree, I only find guardian, warrior and ranger decent to level, the rest are just fragile canon fodder So in the end I levelled a mesmer by mainly running dungeons because their squishiness is just too much.
I found my necro rather tough. He's a minionmancer; I aggro'd 5 centaur once but they were so confused with all my minions, they didn't know who to attack while I stood back and aoe'd them down. I also use death shroud as a panic button and since I'm using a staff, I don't have to be so reliant on my blood fiend. If they can down me, Necros still have the spammable lifesteal