In TES lore dragons are said to be very intelligent creatures, who are able to communicate to people if they wish. In the past dragons have even gave aide at times to people along with people helping them in return. Dragons have also, gasp, been ridden in TES lore. No it wasn't a common sight, but it IS part of the lore and has happened before. I admit I am not a master lore buff, but from information I know and have looked up, is there a reason that all the dragons are evil in Skyrim? It just seems to go against their own lore if every single one is evil, I can understand some for various reasons within the story, but all dragons period? Seems a bit too simple to me.
To me having dragons be "EVIL!!1" is extremely cliche in fantasy in general. Especially when it comes to games. Almost any game that features dragons, especially rpgs, they are treated with the same disdain as your general aggressive animal/creature. Big and powerful yes, but generally coming off as nothing more then another trophy creature to kill in the game with no real depth behind ithem.
I was hoping that with Skyrim they would rise above the usual cliche fantasy dragons. Actually make them complex intelligent beings that throughout the story you get thrown into with you come to learn and uncover more about them . Along with having dragons that could be good, bad, or even a bit of both depending on the type of player you choose to be. To me when it comes to rpgs in general, I like stories that are less direct and have a great deal of mystery and complex characters to get intertwined within the story. It's part of what I like about your more general mature oriented rpgs lately.