I think Fallout 2 needed a fan made patch, but Star Wars: KOTOR II definitely needed one to access the end game content. That was Obsidian, and the exact moment the budget ran out was very very obvious.
Yeah, that was the one. I must have played Fallout 2 at least 5 times when I was in high school / college. I was never able to finish the power plant quest correctly. Not once.
There was also some sort of bug involving the car, but I never ran into it.
I so want to pick up New Vegas, but I also hate dealing with bugs. Oh well, I'm playing through Red Dead Redemption right now. I'll see where things stand once I finish with that.