Vampire is completely dumb and broken. Save for one passive and one skill, mist form its basically useless. The sacrifices you have to take to be one is absurd. The health mechanics are stupid, there should be 'blood' mechanics instead. That would make so much more sense. But if thats not possible changing the skill that sucks your life away, in exchange for more damage either needs to be buffed massively, or the health lost during the duration of the skill should be a life saving mechanic added. Something like, health consumed is returned just before death. That would be one powerful ability and really worth while. I have no comment on feeding, its always been useless. Honestly if they went with the Morrowind style absorb health type drain it would have made so much more sense.
Arcanist is honestly broken, I love the class don't get me wrong and would love for it to stay where it is, but its broken. Too much of everything, its literally perfect in the way it works. Every other class needs to be brought up to standard if you don't nerf arcanist.
Mag Necromancer does what exactly now days? It has a few dots, but otherwise nothing. Why? Magic necro could be the most iconic version of necromancy but its got nothing! Aldo lets not forget the micromanage from the underside of tameriel. Four timers have to be maintained at all times, blast bones, armor buff, ghost, and mage skeleton. It honestly, stupid hard. Let not even talk about the tether stuff.
Honestly, i'd be nice if Nightblade didn't have to be gank meta all the time freaking time. It's siphon skills are basically meh, nothing like what they used to be. Honestly, they're almost useless. Even a sap tank isn't possible anymore really. Its dots are ok I suppose but just nothing fantastic. And shadow is honestly a lost opportunity. So much could be done with shadow as far as unique mechanics due to its theme, but its just meh.
I don't really have a comment on sorc, it was my first class, its just there. It has no real identity anymore. At least to me. I use it for its speed lightning buff to get around faster as a crafter.
No comments on dk, or templar as, I find dk easy mode, and templar's spear skills annoying due to their graphics. There was SOOO many more ways graphically you could have done either of those skills that makes more sense for the paladin theme but MEH. its the only class I don't actually have.
I've only been back about three weeks, and this is my overall general impression and experience with the classes.