The game is huge and overwhelming, but it simply did not hold my attention. Each city is unique and brims with quests, but the dungeons look pretty much the same. The game also isn't that challenging unless you've downloaded the patch that adds a difficulty slider (and even then...); I raided one Daedric Shrine and my character became suddenly wealthy. I guess the developers thought it'd be rewarding, but the fact is that all the baddies in such shrines seem to die in one hit.
Freedom of movement and sub-quests make the main plot seem redundant; the game lacks focus. There is very little sense of plot advancement. The navigation, simply put, is the worst I've ever seen. You can get lost very easily in Morrowind.