In fairness you cannot compare Microsoft's flight procedure simulator to an air combat simulator. The markets are totally different, their uses are utterly different, and frankly the FS series in stock form has worse graphic textures than Oleg's by a mile. And as many map inaccuracies, if not more, as well.
I do give Microsoft credit though, they have made it possible for a number of "entrepreneurs" to bilk customers out of a lot of cash for single aircraft models and improved ground tiles. Quite the scam. Nice damage modeling too...