A poor man's Oblivion. This description may seem a bit damning, but it puts the game in awfully fine company when you consider the sheer greatness of Bethesda's role-playing game opus.
Huge scope and setting; Smooth; simple RPG system that still allows for a lot of character customization; Great variety of quests; Nice-looking visuals
Too sparse in monsters and fine details to fill up such a big gameworld; Default difficulty setting is way too hard