It currently depends on the player or game source: - Deathwing, a multiplayer cooperative game based in the WH40K universe have an AI problem, which makes the game utterly boring as enemies will do exactly the same each time. - AI bots have the additional value to fill less played games, expanding their lifetime value. - Finally, I can't dedicate 100+ hours to become good in a multiplayer game, so I'll rather smooth the experience combining human players and AI bots.