Ok, let's be serious.
They are dragons at the service of Alduin, whose intention is to set the world on fire. Yes, they are intelligent, but they are doing what the have to do: destroying the world.
Now, you are the last Dragonborn, the saviour of Mankind, the only one able to defeat Alduin and save the world. You're a killing-dragon machine.
Would you be friend of somebody that wants you dead? I don't think so.
now why does it cheapen the game to add humor in a few nooks and crannies and if you look closely at oblivion you'll notice rare, obscure bits of humor that don't compromise the game. and stop with the wise cracks Im not suggesting a lot just riding a dragon and blowing stuff up would be awesome/epic and how to train a dragon svcks crap, a lot of it. Nosirrah422-signing out (really)
Yes... nah, you are not asking for anything at all, just a little bit...
Did you know that the mainquest is about dragons (and not in the way you want them, luckily)? Did you know that turning into a dragon would have no sense? And did you know that it's the time of saving the world via KILLING dragons, not joking with them?
Oh, BTW, "How to train you dragon" rocks, but it shouldn't be mixed with Skyrim.