Why can't every developer be Infinity Ward? When asked by Videogamer.com why Modern Warfare 2's co-op was limited to two players, spokesman Robert Bowling said, "Two player seemed to be the magic number for co-op. That's when it stayed really fun and intense without becoming a clusterf**k of things."
Bowling also said that the whole game won't be playable in co-op because the developer is "crafting a very specific experience" and doesn't want to "ruin that by cramming co-op into it." While it's nice to see a company stick to its guns like that, we figure developers who sell a hojillion copies of a game can pretty much write their own menus