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:
2. Tyranny
4. The Outer Worlds
7. New Vegas, I guess
The first two, especially, are among my favorite games of all time.
Edited to exclude the stuff I haven't played, but yeah, that, pretty much. I liked New Vegas, but less than the other two Obsidian games shown there and less than the other two modern Fallout games (not including that MMO thing). It's okay, but in the same way that Gothic 3 is okay.
Based on my previous comments about objectivity and stuff I'm not claiming that this is anything but an opinion; just an opinion from someone who remains mystified about why FNV gets so many accolades from self-styled hardcore gamers.