I've felt like every expansion is better than the last, but I also feel like ARR is really boring and that in general all of the updates to classes and dungeons have made the early game content worse with time. There isn't a single class that feels good to play at level 50 or 60 anymore, all of the gimmicks from old dungeons have been smoothed over leaving nothing interesting or memorable behind, after the initial "new player experience" where you learn the basics of the game you then have to play about thirty hours of formulaic slop until you get to about halfway through Stormblood and suddenly the game starts introducing new mechanics again.