Controller Styles and the UI
So the UI in FF14 looks a lot like a console game. Players have a variety of button presses that they must perform in order to do an attack. For example, there are 4 diamonds in the default UI. The left trigger on my Xbox 360 controller activated the left 2 diamonds whereas the right activated the right 2 diamonds. Within these, the X, Y, B, A buttons are all tied to an attack or command. Up, Down, Left, Right are tied to the other commands as well. It was extremely confusing at first but after an hour or two it felt natural and actually let me sit back and play the game like a console game. I could see players lying on their couch working their way through solo content. I liked this because I am a console gamer primarily. However, for those of you tied to mouse and keyboard, there is A New Hope.
Thanks to the clamoring of fans, the user interface can be manipulated almost completely. This customization comes in the form of something resembling WoW's familiar user interface and can be seen to the right.
By accessing the customization commands, players gained access to Control / Alt numbered bars with an additional 5 bars that can be moved around and manipulated. While FF14 doesn't really allow for modifying augmentations to UI like WoW does, the ability to manipulate it is extremely open.
The nicest part of this UI was that it has absolutely no input lag. When I originally played FF14, I couldn't handle the input lag. SWTOR, and RIFT to a lesser extent, frustrated the hell out of me because my button presses didn't create an effect on screen until after a noticeable delay. Even in old FF11 there could be text input lag if you were standing in Jeuno trying to talk to someone.
Overall, any type of player will be able to create the experience they want as long as that experience falls within the limitation Square Enix has put on you. Getting back to player consciousness and the ease of WoW, the loss of addons will be significant as players try to make the UI do what they want. Without the ability to listen to game data for Boss abilities for something like Deadly Boss Mods, players are left to act of their own accord and so, because of WoW, players may find reason to dislike this game.