Low level Dragons are weak, high level ones are not. We are just usually stronger at higher levels.

TES games have never been focused on combat. Instead, you immerse your character in a world where combat exists. Some or most of the time, combat can be avoided or minimized, if you choose to. If you want to focus on combat, it is better to have a mid level character just for the record. Some of us like to build a high level character so we don't have to worry about combat for some character's, like my Explorer. Fights are just an obstacle to him, not challenge. But, I digress.

I agree the dragons are not as much a fight as they could have been. Sure, some dragons would be push overs, but some would remind just how fearsome they are. Problem is, having one of these uber dragons spawn in a town. That could be disastrous to some quests, or just doing business. So, maybe a few hand placed uber dragons that we have to go find.