Different team, different project. That being said, I think Obsidian offered some pretty compelling content for New Vegas.
We can't wait to share more of what we're working on for Skyrim.
Obsidian are the people devs let borrow their IP when they just want to milk it for some spending money until a real dev team can make the next "real" game in the series.
KOTOR 2 was LucasArt's fault.
Sure.
And NWN 2 was EAware's, FO:NV was Bugthesda's, and Alpha Protocol was SEGA's.
Does that about cover it?

Obsidian makes Bugthesda's quality control look flawless.