I am liking the pugnacious tone. I suspect that with IE9 shipped, they feel they've earned the right to make a forceful argument on how browser development should happen.
"Hey kid. Releasing a new version every few weeks ain't professional."
"Hey kid. Releasing a new version every few weeks ain't professional."
As for "how browser development should happen," I think the people who can make the argument on that are the ones who've been leading the pack for the last 5+ years, not the ones who are still trying to catch up despite starting out with a giant lead.