Expecting devs or mods to come in here and say "Yes, it'll be better than FO3" (admitting that there were many issues with it on PS3) or "Sorry, it'll be just as bad" is kind of silly, don't y'all think?
Especially because if it was a moderator saying it, we'd be pulling stuff out of our butts. None of us have played Fallout: New Vegas.
In my experience, expansions/downloadable content don't get the play testing games do. For example, Bloodmoon (the second expansion for Morrowind) caused a game breaking bug for Tribunal (The first expansion). There was also a bug basically caused by Shivering Isles in Oblivion that made the game unplayable. Both of these were later patched, but yeah, later additions of content can cause problems.