Most of those games could be finished in the span of a rental, and I didn't really much care for Oblivion. I've heard Fallout 3 is essentially Oblivion 2, and has several of the same problems, chief amongst them being that one day the reality of the repetition you're enduring sinks in and you no longer want to play, however I can't personally vouch for or against it.
With videogames being so expensive nowadays, I rarely buy anything that I don't plan to get some online play out of. For sixty dollars, I expect a product that will keep me busy for at least 40 hours, but without multiplayer, many products don't go that far these days. It always feels like a ripoff to me when I finish a game inside of a week and I know that, while I might play it a little bit more, I could've replicated this whole experience with an eight dollar rental.
Better yet, if you're in a region of the world that supports such a service, check out something like Gamefly or what have you, that way you don't have to pick.
- J