Seeing that on master they kill me with one breath attack I'm glad they get distracted.
You probably hit the nail on the head, there. If they didn't make the dragons easily distracted and pretty easy to kill, they would wipe the ground with your hero [censored], and you'd never kill one. Since killing dragons is the vehicle by which you gain shouts and power to advance in the game, they couldn't be having them use you as a mop all the time. So, dragons are easily distracted so they don't kill you instantly, and they are easy to kill so you don't have to struggle too much to get shouts, etc. If it was hard, nubs and casuals would give up quickly and not play anymore. So basically, dragons are just a loot/shout pinata that you pop every so often as you wander around.
Heh, I dismounted my horse to fight one just outside of Whiterun yesterday, and the dragon completely ignored me and Lydia the whole time as she hacked on it and I pincushioned it with arrows... and just focused on my poor horse. Whoever is arguing that "your character is not the only thing in the world, dragons attack everything'... that argument falls apart when you factor in that you are the only one killing it, hacking on it, filling it with arrows, causing it pain and suffering.... unless the vastly intelligent and resourceful dragonkin evolved with a complete lack of a genetic ability to tell what potential threats are dangerous to it, and which are not... which is rather unlikely... then that is just plain stupid. My horse certainly wasn't causing it any harm, and was only trying to escape. It's a fakey and affected game mechanic to make it easier for the player to kill dragons, nothing more.