While I wanted to like Oblivion, it is just too big. You lose track of what's going on, and I feel like I just waste time wandering around nowhere. As someone whom has limited gaming time, I feel like it takes too much time to do something, and an hour has gone by and I have barely completed one quest, cause I've been running around trying to get to places. I'm sure Oblivion contains a great game, but it's getting to it that is the hard part. If I lost my job and had a lot more time on my hands, I'm sure I could dedicate time to making my way through it.
DAO fits better, because you always feel like you are furthering the story, and it's more immediate. It's story feels like some epic hollywood blockbuster also, like a Lord of the Rings, which is cool.
I've yet to play DKS, but hopefully it doesn't fall too much down Oblivions road.