Have you played until you reached the more advanced dragons? It's true, I can beat a regular dragon with barely any effort, but those Ancient Dragons.. oh man. They aren't so easy...
Yes, there are some tough dragons in the game, but that's later, when you're higher level. Which is my point - the dragons come in *too early* in the game. Since the devs want the dragons to be beatable by the player, they make the early dragons beatable by a level 5 to 6 character (it might not be easy, but it's possible at those early levels). This is what I'm talking about. Other than that dragon outside Whiterun which sort of starts the main quest, the player shouldn't really be encountering dragons before level 20-30ish, so that A) the dragons would always be scaled up to a level where they're appropriately strong compared to other threats the player faces like bandits, sabre cats, and giants, and B) The player is strong enough to plausibly be slaying dragons.
It's just hard to believe that the epic threat of dragons, which is supposed to be some sort of ultimate threat to humankind, can be fairly easily slain by a level 5 character. As someone else said, if they were that easy, then nobody would care about them - they'd be about the same threat level as bandits and bears, which the humanoids have managed for thousands of years. It's this mental discord which bothers me - everyone's so terrified of dragons, but I'm a weak, low-level character and I'm slaying them left and right. Cognitive Dissonance.