Overall, this is a great game and probably the best single player RPG out there right now, but it could be better, for example, having more factions to join and side quests. It would be great if the game allows you to choose your path in the main quest, so you would have different ending depending on how you accomplish the main quest, etc.

Now do I recommend that you go out and buy Elder Scrolls 4: Oblivion? If you have the proper PC (don't forget to check out supported video chipsets) to run this game, by all means, definitely go out and buy this game!