The biggest complaint I've heard besides the ARR filler quest, is the game is the combat is awful at low level. Mashing 3 buttons over and over isn't really all that interesting and god forbid you pick lancer or thaumaturge since you'll be waiting until level 40+ for anything interesting.
I'm not sure if it's a big enough problem to warrant a fix but introducing the abilities earlier and then giving traits that enhance their potency at higher levels would be a good one but then you run into the issue of lack of progression at the top end of leveling.
Game seems to be growing despite either complaint and I didn't think the ARR rework was really all that necessary. Either you like the way the game is enough to play it or you made a 2 hour long video about how you miss game design from 1998 and somehow people not wanting to play with you is the game's fault and not your own.