Well, technically MS isn't really developing any of them (if you are thinking Gears and Halo). Just helping publish and promote - 2nd party, maybe. The stuff MS themselves have really tried to get going from the ground up is anything BUT the super soldiers, because they know that expansion is limited if you only make shooters.
It's not like they haven't tried other things - pinatas anyone? (Yes, please.) they just haven't been bought because the soldiers came first and that's the dominant user at the moment.







