I'd actually prefer Bethesda over Obsidian because F:NV didn't feel fufilling like F3, I know it's off topic but I say Bethseda makes most of the game.
No.
gamesas doing the world, and Obsidian writing, dialogues and character creating + gameplay mechanics.
NV was full-filling enough to qualify as a good
Fallout game.
Hell, Obsidian is basicly the old Black Isle staff, makers of Fallout 1 and 2!