I should be able to access social features (like social lists) through hotkeys and without having to wade through laggy menus, like I can in just about every other MMO. I should get short notifications when my friends come online or get offline (toggled via a menu option and not some obscure slash command, please).

In general, one of the areas where this game hurts the most is the social/UI features, which is bad in a game that is supposed to rely strongly on party play and forming social groups.