My biggest problem with the game is healer gameplay, I have minor annoyances like most people presumably do but I don't think XIV has any incredibly glaring or gaping flaws outside of the direction they're taking jobs.
I think housing could be handled way better and its pretty disastrous in implementation but I don't think it's game ruining; the gameplay IS something we interact with everytime we play this game unless we just want to idle and chat so I'd like to have more than just Broil to spam in all content.