I honestly think that even with all the studios MS bought up, not 1 game from any of those studios will be as good, or even do as good as Spiderman by its self. Not even bringing God Of War into the discussion. It takes years, to get your studio to make top tier games like Sony and Nintendo 1st party games.
This is very true, outside of Forza i'd be very surprised if all these studios suddenly churn out masterpieces that galvanise the industry.