Fifteen years ago we were trying to convince our boss to take a chance on replacing that sparc 20 with a linux machine. If back then these vulnerabilities had come to light it would have made our jobs really hard. Thankfully linux has had a decade to prove itself in the server room. At this point the pendulum as swung the other direction. When we have to deploy a windows box we need to think about how it's going to fit into our nice cohesive unix environment.
I'd argue that these revelations and the many more to come can be demonstrated that the FOSS community cares about the quality of the software out there and is continuing to improve it. Yeah, this stuff is public, but the openness of our community almost invariably means that lots of dirty laundry ends up on the line for everybody to see.
Microsoft has managed to shit show their patching operation so many times it's an easy target to FUD in the other direction.