Within at least 10 fast travels (or around 15 minutes wandering the wilderness) I will experience an attack from a dragon.
Don't get me wrong, the idea of random dragon attacks are great, but I thought dragon attacks were going to be a reasonably special part in the game, and bumping into one every 15 minutes does not make the experience any more thrilling (especially when they can be killed with very little effort, and end up filling your inventory with their loot).
Perhaps when editing tools become available the frequency of dragon attacks can be lowered, but until then it has become an extremely annoying part of the game.