There are certainly a few corner cases left in which flash remains a better fit, but it's losing territory, fast. Good work Nissan.
That Nissan example ran pretty clunkily on my laptop and another desktop I checked in the office.
(That said, gradient transparencies always seem to doom Flash pieces to slow-hell for me.)
Anyway, the quip with rendering performance is only a matter of time. With every browser release, CSS and HTML rendering performance is increased, for example, by leveraging GPU acceleration.
Flash will be beaten soon, I'm sure. And at least that works for every platform, not just the ones on which Adobe decides it's important.
I've had a bad day dealing with HTML email newsletters so I'm probably a bit more pessimistic about it than usual, but all sides of working on the web are a serious pain in the arse!
It has been said before: not Flash is the devil. It's people who program but who have no clue how it's done. They have destroyed the reputation of a not-too-bad platform.