Dragons are the big bads of the game. When you see one, it's suppose to give you that "Oh crap!" feeling. That feeling isn't going to work if they get too much on-screen time. At the same time, a lot of time went into them and I'm sure we'll get our fill of fighting dragons without having it feel like it's just a dragon fighting simulation.
They're focusing on them a little too much, but we've never had dragons (Martin became the avatar of Akatosh, not a dragon) in the elder scrolls before.
We've just heard about them a little too much and very little about other things.
Also, in TESA: Redguard you fight a dragon.