Microsoft has certainly produced some good games. I loved Halo 5, and was satisfied with Gears of War 4. ReCore is creative and Forza always fills the racing niche better than its rivals. I think Sunset Overdrive was a promising new IP that didn’t get enough love. Dead Rising and State of Decay are uh, adequate zombie franchises.
But the list sort of peters out there, and the only game there I would actually consider can't-miss is probably Halo. If you flip to Sony, you have Until Dawn, Uncharted 4, Bloodborne, The Last Guardian, Nioh and Horizon Zero Dawn, with The Last of Us 2 and God of War 4 up ahead. And most of these aren’t just good. Many of the released titles are Game of the Year contenders in some capacity, which is something I don’t think anyone has said lately about Gears 4 or Halo Wars 2 outside of die-hard Xbox fans.
EDIT: Another important bit.
Sony also does not have a problem encouraging its partners and in-house developers to work on whatever the hell they want to work on. That’s how you get Bloodborne from Souls’ From Software or Until Dawn from Little Big Planet helper Supermassive or Horizon Zero Dawn from Killzone’s Guerrilla. While it’s unclear if this is exactly how this played out, it stands to reason that say, Bungie wanted to work on something new with Destiny, but Microsoft valued Halo more than it did Bungie, so it didn’t pay Bungie enough to stay and it went to Activision. While Microsoft got to keep Halo, it's missing out on exclusive access to one of the most beloved new IPs of this generation as a result.