Speaking on this situation. I have played only online in skirmish and Panthenon. And sometimes the system has just put me into a game with ONLY AI's so its easy wins. Not only taht, sometimes when a game starts with people all the other people drop out from my game. So my wins are honest, since im using the online system, but its been either dropping everyone else thus defaulting me a win or actually just insertin AI's in if it can't find people anyways.
In my opinion the devs should just eliminate a player completely if they disconnect or lag out or leave the game instead of allowing a stupid AI to control that said hero and then feed the enemy completely. And if everyone drops from someones game...im not sure what to do there. And im wondering, do they play their own version too? Thus getting a free win as well?