Optimizing for fun is kind of impossible, at least in the sense of making a fun but unfair game. Fun games are inherently ones where you're matched with players

Optimizing for fun is kind of impossible, at least in the sense of making a fun but unfair game. Fun games are inherently ones where you're matched with players at your skill level, and you're actually being challenged while still getting kills. Going 30-0 is only fun for so long (and for the people who don't get tired of it, they often go and download a cheating program).