I play single player games more than co-op.
but a lot of single player games, with a bit of tweaking, could have really nice co-op modes as well as a single player. instead you get shitty ai buddies, or tacked on multiplayer modes.
When I write a single player game I always allow optional co-op mode
and optional crappy AI buddies both.
And if your AI buddy sux u can kill him and take all his kewl stuff :roflmao: