I just got back from a few monthkittenus a few days ago and playing mesmer feels amazing now. It feels like were really in a good spot. Not having to rely on illusions so much feels good and the PU buff is really useful. I think mesmers are definitely more on par with thieves, if not better. There is much more sustain and options in build diversity now which I like.
The only thing I think may be a bit strong are mantras. Mainly because mantras have no counterplay, power/stun mantras I mean.