I agree. If you insist on having it be animated make it a video. I'd actually just prefer a few screenshots showing the key things that I can go back and forth between so I don't have to sit and watch something that could be summed up in 3 or 4 slides that are digested in a few seconds.
Ditto. Too fast. For me this isn't an exemplar of effective communication. It's a complete failure to deliver whatever that animation was trying to communicate because I only got 1 second each to absorb the text and the slide. Maybe I'm just slow, but a few stacked section tags with the same information presented statically would've been so much more effective.
Javascript for it's own sake, hampering effective communication; it's the Flash splash page all over again.