Everybody always says that New Vegas is Obsidian's best game, or only good game, whatever. It seems to be the prevailing opinion. But I didn't even like New Vegas much, and I love a bunch of Obsidian's other games, so I guess I'm a weirdo.
Here's my favorite Obsidian games in descending order:
1. Alpha Protocol 2. Tyranny 3. Neverwinter Nights 2 (and expansions, especially Mask of the Betrayer) 4. The Outer Worlds 5. Pillars of Eternity 2 6. Pillars of Eternity 7. New Vegas, I guess
The first two, especially, are among my favorite games of all time.
Was gonna say that New Vegas in the bottom is weird, then I saw Alpha Protocol on top.