Addictive and fleshed-out, with so many decisions to be made.
The gameplay is pretty much standard AD&D so do not expect anything revolutionary here, but it's solid nonetheless. Where this game stands out is the level of interactivity and immersiveness it presents. The videos are well-placed and the thoughtful use of the game engine to render them adds to the seamless experience of being a part of an epic world.
Simply put, it's and RPG that puts the emphasis on "role-playing". The only downside I can think of is that the areas to explore aren't that many, but they are huge and have truly outstanding design.
p.s If you're a PC user, download one of those HD texture-packs, it'd make a world of difference since the game's default textures aren't anywhere as good.