See I found Rift like a clunky version of WoW, it just doesn't play as "smooth" and the UI (at least a few months ago) was a bit too in-your-face for my tastes. That and the talent system was incredibly odd.
I agree and that is why i love it. WoW is a very flat game, it is too polished, too simple. Rift has far more depth to it, much more to do and guides you through the (much prettier) world much better. The clunkiness, i have found, is from the extra content being thrown at you immediately, rather than the game being made poorly. The only thing i would maybe add or change is explaining the terminology. Planar is not explained to you well at all for instance.
As for the ui, straight off the bat you can customise it completely, however you want to, move anything anywhere, change the sizes as you please, so i do not understand what you mean by that point.
As for the talent system, that is a masterpiece in my eyes. Whilst there are only a few races and classes, by having it so open it allows you to play any race and any class in (nearly) any way. It is hard to get a grasp of at first and you will redo it again and again, but you can reroll as you please, have more than one setup on one roon and relearn, so like anything, it is difficult to understand at first, easy to learn and like any talent system in any game, difficult to master