As an answer to the thread title:

2 minute burst window needs to burn in the fire. Plain and simple first point.

DPS: Personally, I think all of the dps play differently enough so that the 2-minute burst window doesn't hinder them as much. This does, however, result in burst windows feeling same-y because everything is crammed into it.

Healers: lol. lmao. All I can do is really preach what most everyone is saying in the Healer forum. They somehow managed to take the role I'm absolutely awful at in mmo's an absolute snoozefest. Adventure Quest Worlds has deeper combat than the healers in this game, and that's a flash player mmo.

Tanks: I could probably write a thesis on this honestly. However, I will try to be fair here with possibly some minor salt.

Warrior) Fulfills its niche greatly. It's simple, it's unga bunga. It's main problem is that it just gets boring. The party healing on this job is way too goddamn high, it has absolutely no right being so potent with no cost to themselves.

Paladin) This is a bit of a mixed bag for me, I miss the old paladin, but the new one is definitely simpler and easier to execute. Goring Blade needs to be something else other than a 60s high potency skill but I can't believe they'll actually modify it. Getting Bulwark back was nice.

Gunbreaker) This is in a pretty great spot for me, honestly. I don't have very many complaints, if any, about it.

Dark Knight) I've already gone on so many tirades since Shadowbringers launch about it, but I'll try to keep this brief. It's entire identity got neutered when they got rid of Dark Arts instead reworking or revamping it, it barely exists in it's current state. Same thing as Darkside, it might as well be a passive or deleted because that UI element is essentially useless as unless you actively try to it isn't going to fall of. Living Shadow is a great chunk of dps and yet it doesn't feel it, since you just press it and forget about it since there's no interaction. Delirium NEEDS to be something else other than a IR clone and our Blood Gauge needs to have more interaction with our kit because otherwise it will continue to be seen as a Warrior clone with more ogcd's to weave.

Balance has been kinda bad, honestly. The 2-minute burst window and crit variance are severe hinderances, and we could do with potency squishes going into 7.0, otherwise it will persist unless they just make all high potency skills auto direct-crit