Windows got massively worse during his tenure in literally everything that can get worse including half-legal snooping on all users including Enterprise ones (I stand by the statement that this is idiotic long term strategy driven by childish emotions like FOMO - no way he didn't have a direct say in this).
Office is certainly PITA and getting worse in my experience, but that can be corporate modifications/restrictions I am exposed to.
Teams was, is and probably forever will be pathetic, buggy, slow and just a bad joke compared to some competition with 1% of their budget.
These are core extremely visible products and for most of mankind 100% of the surface with MS. There is not even an attempt for corrections, direction is set and rest are details.
And despite the shittiness, even that 5% is doing great because their audience is now billions of mostly computer-illiterate people, who don't even have an opinion on the technical merits, the performance, the bugginess, the snooping, the feature gap, etc etc etc.
The opinion of few million geeks who are mostly not using Windows anyway (or whose only contacts with anything Microsoft are due to their employers' choice of platform) doesn't ultimately matter much, Microsoft knows it, and they have no reason to change direction despite our frustration. Some better privacy law could nudge them, anything short of a legal directive won't go far.