It depends, I think, on what one values in a game. A person who values creativity or willingness to try things will probably be more impressed by nobodies than someone who prefers refinement.

That said I think at the time of my post I was mostly thinking of games like Colossal Cave Adventure, Zork, Tetris, Doom, Myst, and Minecraft... all great games (well... Minecraft maybe not so much), all made by small teams or in some cases one person.