The UI is very clunky dated and could use some major improvements. A few examples below.
1. In my party and alliance frames I should be able to see peoples buffs and debuffs. MMOs have come a long way since FFXI was released and this is pretty much the standard now. In my party and alliance frames I should have all the information I need to preform my job well. I should be able to see who has what buffs on them and what debuffs need to be removed. Doesn't have to be big but small icons work fine. This stuff has been in Final Fantasy games before 11 so I don't see why it was left out. Having to rely on reading the chat log to see who is effected by a debuff or have them tell you is very archaic.
2. When I target a player or monster your current target info should have a larger frame and the info shown. It would help out healers and people who apply debuffs to monsters to see what debuff needs to be applied. The current target window should also display the amount of HP and MP as well as HP % an enemy has.
3. Debuffs should have a color change in the party frame when a player is effected by a debuff. Once again this is pretty standard in MMOs today. For example if I get poisoned my name and hp bar should turn green to indicate that something is wrong and needs to be fixed.
4. Timers, buffs and debuffs need timers to show how long of a duration they will last. Once again almost every game does this now. It is helpful to see how long a helpfull buff on myself or party member will last, and how long my debuffs and enemy buffs are going to last.
5. UI frame improvements. Stuff like widower already does this but the default UI should so TP and MP values for the whole party and alliance. People should not have to rely on 3rd party tools for a feature that should be in the game.