The CEO of Obsidian is disappointed of how glitchy New Vegas was at launch, but otherwise, Obsidian feels proud of what it made. Obsidian actually feels more disappointed at the failure of their last game, Alpha Protocol, than New Vegas.
Surprisingly, many fans feel this is the "true" Fallout 3.
That is because:
1) Much of the staff from Obsidian were from Black Isle Studios, the original developers of the first two Fallout games
2) The storyline from New Vegas is very similar to Black Isle's cancelled Fallout 3 project, codenamed Van Buren
About New Vegas having a Broken Steel-esque DLC, the senior designer revealed that the game will always end at the Hoover Dam, and they won't extend past the main story