Steven Sinofsky:

It is easy to get wrapped up in debates about specifics, excited by tweaks or surprises, even an occasional scandal, or to wonder about the quality (is this is a good beta?). Under the hood, is a team that over time has done more and executed better than any I can name, ever.

Quite simply, what we’re seeing is some of the most remarkable product engineering over time in history.

High praise from Sinofsky, a guy who has lots of experience with this kind of stuff.