The problem I have with this "attrition" model is that it doesn't take aircraft/pilot reserves or bringing unservicable aircraft back into action into consideration. Or who is actually saying that the player is going to meet the same squadron again? Ain't it possible that it's given a day off to recuperate and repair any damaged aircraft?
Simply put the game needs stability and a better performance before anything else. Then the next big issue for me is a campaign engine, preferable just as in the ancient Red Baron II and not that wannabe-strategy campaign that BoBII has.