This is the first MMO that's hooked me in awhile. That being said, my playtime in comparison to XI has severely dropped, which is probably why I still have plenty to do. I know people have been complaining about the end game grind, but that's what an MMO is. I really don't know what people expect from these games now. More content is still more dungeons leading to gear leading to you having nothing to do once you've obtained said gear.
I've leveled several classes, crafts, gathering classes, randomly go back to older dungeons on my tank, trying to gear my mnk, farmed Ifrit, Garuda, etc. There's plenty to do, I just quite honestly think people have forgotten that's what RPG's and MMO's force you to do, grind, to waste your time.