Well, the classic BSODs were not all Microsoft's fault, many of them were on 3rd party driver developers.
I think the worse thing here is all the subtle breakages and inconsistencies in Windows, as well as in the MS Office suite of products, constant redesigns of things that worked, adding layers upon layers of "make-up" on top that obscures functionality, etc etc.
I think “The Operating System is fundamentally Unstable” is a much bigger problem than “First party applications are redesigned too frequently.”