Because its an MMO. One simply does not judge a game by its looks, you judge how the other games in the franchise play, and feel, and how other games in its genre play.
I think that if the online version of The Elder Scrolls is as good or better than the most recent of their games, Skyrim, Bethesda might create one of the best games in the history of video gaming, again. I'm actually looking forward to this, since I'm a BIG Skyrim fan.