I played EQ for some weeks and participated in the AC beta test, and I must say I prefered AC. The skill and experience system is extremely cool, I'd love to see a similar implementation in more games. Keep in mind that this is not a very in-depth look, you can't get any in-depth experience in an MMORPG in mere weeks.
Anyway, NWN (btw, it's by Bioware - Interplay is the publisher, not the developer) will definitively be a very cool game, and it keeps one of the top spots in my most-wanted list. However, I wouldn't call NWN a MMORPG, as it's not a persistant world (at least not in the way of the current MMORPGs), and with a typical game size of 6 people, it's hardly massivly multiplayer.