Scoobes on 12 December 2010
As others have said, New Vegas was developed by Obsidian. Fallout 3 and Oblivion had bugs, but less than New Vegas.
They're also developing a new engine so it really could go either way. I expect their will be some bugs due to the scale of the game, but as long as they aren't too severe or common and the game is amazing, I won't care too much.
