Hmm, Neb just one word of advice, go check out the in-play movies from NWN and you will see that you can click all you want, but all your actions are "cued" in an action cue, you tell what you want to do and your character perform it. Not like Diablo 2 that is. Morrowind seems "interesting" tried daggerfall, but well found it a bit to nah IMHO, but looks interesting, awaiting Danīs commets on that one.
Dungon siege seems to be the most action filled one, having a seemless action with very short load times and also very fluent. This seems to be the least D&D roleplaying style game of the three. Morrowind will be standard RPG character developement as will NWN have.
Personally I will eat noodles for a couple of months and have them all!
At least try unless someone warns me for a new POR experience..
But check out thoose movies!! Looks great fun!