25Final Fantasy XIV
Well, I don't suppose this one's surprising anyone. Final Fantasy XIV's launch was a disaster, and long derided as an incredible misstep after the relative success of the series' initial MMO outing, Final Fantasy XI. It's doubtful that any Final Fantasy release to date has been met with such passionate fan backlash.
game was a broken, buggy, and a disappointing grind fest with a terrible UI and uninspired world design on release in 2010, with players and critics less than timid in pointing these things out. It was so terrible that Square Enix understandably rebooted the entirety of it over the next couple of years. But we'll touch on that later down the list.