I think,if oblivion is on the 4th place,morrowind deserves the 1st...
Innovative concept: Guns vs. Magic. And totally awesome otherwise.
I loved this game and was my favorite RPG, and first RPG I have ever played. Ever since I was little, I Have loved this game and recommend to all RPG fans, After all it is very diverse and has lots of monsters, items and artifacts to make it a very good classic RPG.
the sequel to an awesome game, and lived up to the ante, any bad bug were QUICKLY fixed with patches, now its an almost bugless game