I've said it before, and I say again:
People blame Bethesda for a "buggy" game when they should be blaming their mods and their crappy, bloated, virus ridden PC for breaking their games.
Skyrim runs fine for me, Dawnguard also has no issues, and I have 365 hours in under 4 different characters.
A game made by imperfect people will not be perfect, so wake up and come back to reality.
Now that is a stupid statement to come with. Viruses and mods are the cause of all the bugs?
I sure hope you're aware that the Playstation3 and Xbox360 users experience bugs as well. Mods and viruses doesn't seem to cause their bugs...
How about the missing textures from Bethesda's HD DLC? Those are caused by viruses and mods right?
Chances are you're not paying attention to some of the bugs in the game, and are lucky to not have the game breaking ones.
But don't be so naive to claim that because you don't find the bugs, they don't exist.