We know. They haven't stopped jamming that down our throats since January. They look cool, but not that cool. I'd prefer to see the lore side of them... assuming there is an in-depth lore side to them.
I despised all the worst things about Oblivion as much as any other disgruntled Elder Scrolls fan, have gotten to know the lore, educated others about it, debated theories, expressed displeasure about all of the game's flaws, lamented the lack of spears and crossbows and throwing weapons in Skyrim, the corner-cutting on certain skills, etc. and so forth, and my opinion is this:
Yes, they do look that [censored] cool. I honestly cannot think of a game that makes dragons look better than this in terms of how they look, sound, animate, and interact with the things around them. Experiencing them firsthand will tell if there is anything lacking about them or if there's something we have to experience to get a true grip on things, but from what we've seen they look amazing. As for the lore: Michael Kirkbride has given Skyrim's lore his thumbs-up. That's good enough for me.