I come to notice that mesmers might be one of the most damaging classes.
Energy burn(72 dmg) (10 mana) Cast On Anything
Blackfire(119 dmg) (15 mana) On Spell Casters
Wastrel's Worry(53 dmg) (5 mana) On Anything
Seriously, these numbers are higher than elementalist spells. Forget armor penetration from lightning, all these spells have a fixed amount of damage that never changes.
Also, the health degeneration with Mantra of Persistence plus Conjure Phantasm can rival Mark of Rodgort plus any fire spell. It's just a cast and forget, on multiple enemies when stacked with Mantra of Recovery.
Mana stealing is also in the picture.
I'm only comparing the paper figures against the elementalist, but if these things are true, which I don't know if they are, might as well be a full mesmer :D