I could write you a book but I'll try to keep it to my 2 cents

Tanks
Drk would love for it to have more dark magic and not feel like a WAR
GNB not bad though the dmg buff duration could be better
PLD sad they took the dot the rewoke is meh wish is had more depth but I can live with what it is
WAR I need more buttons or dmg otherwise stop making 2 of the same button its kinda annoying

DPS(Melee)
Sam Needs a rework
MNK need a animation rework and form shift needs to be off the global also take the gauge off of PB
DRG eh I can't say much since I don't play enough but i feel its going in a good direction just needs some spice
RPR wish they were faster or some of their basic abilities where off the global other then that is new so not much to say
NIN either a rework or organize the dang jutsu better don't like the clipping is getting old

DPS(RNG)
MCH get rid of gunfu and bring more of the stuff they been putting out so far feels like a real MCH
BRD needs something to stand out IDK but is hard to pick it over DNC (Maybe another RNG dps would help)

DPS(Magic)
BLM No comment
SUM Basic
RDM Eh solid

Healer
WHT please revert thin air
AST alot to say and yet nothing at all. Its not bad but I still miss Older versions
SCH Basic would love for them to do something more with your summon
SGE love and hate it wish they put the mit on pneuma, wish this and that but just like AST its not bad

Overall healer just feel the plainest to me followed by tanks then RNG