Classic Epic RPG
Immersive doesn't really describe this game there are so many sub quests thats its very easy to forget about the main quest and get embroiled in guild politics or just a local errand for a farmer or perhaps a minor deity might need a helping hand.
Whilst the quests can be described as intelligently thought through there are a few glitches but nothing that spoils the game play. Whilst Oblivion has flaws and glitches it is still a brilliant game.
If you enjoy RPG's and you've not yet played Oblivion Elder Scrolls than do so now its simply amazing. However be prepared to say goodbye to a few hundred hours and plenty of sleep (Just doing one last quest!!).