Oblivion was probably one of the most anticipated games for me. The trailers and the way it was talked about made it seem like it was going to be so amazing. I really loved the game no doubt, but when I played it, It wasn't as special as it was made out to be. I guess it's the way devs hype it up.
No, its the way YOU hype it up to yourself.
Aside from some of the Radiant AI features, Oblivion was pretty spot on to what was advertised as far as it concerned me. There wasn't really anything missing, and it was exactly as I was lead to believe it was going to be. Your big mistake is to assume the game was going to be sooooo amazing, and think that every feature is going to be as absolutely amazing as it possibly could be. Oblivion was bound to be an improved Morrowind, and thats all it was. Any assumption that it was going to be the holy grail of gaming and innovation was a mistake on your part.
The same thing is going to be true with Skyrim. I see so many people around here hyping Skyrim up, assuming its going to be the best game ever, and taking all the info about it to the absolute extreme. I've not read one thing about Skyrim that leads me to believe its going to be some massive leap over Oblivion, or that its going to be some super amazing game. Sure there are some nice new features, and I have no doubt its going to be a really good game... but its just going to be a better Oblivion (with a new story of course), just like Oblivion was a better Morrowind. If you assume its going to be more then that, and over estimate how good some of the games features are going to be (theres going to be a ton of let down around here when it comes to Radiant Story for example), then its your own fault when the game feels over hyped to you.