I think what annoys me the most is when the game drops stuff that nobody in the party can use. I just had a run of The Vault, with two casters, where every drop was for MNK or for NIN. You can argue "oh, but what about alt classes?", but at this point in Heavensward, most people will be running the dungeons at the class they're currently attempting to level up. It's different than 2.0 where everything we got was immediately usable by any level 50 class -- having items dropping that nobody can use is wasteful.

It'd make more sense for the loot to be tweaked in favor of the party composition upon entering the dungeon.