The pac-man ad is a counterpoint. It's an ad with suspense and a twist. During the Superbowl, you have to watch the whole thing. I saw it on youtube, the suspense was curious, then there was the reveal - okay, got it now, no need to watch the rest of the light show. On Youtube, you can't recapture interest, but if someone has to watch the whole thing, they can re-engage later in the ad.

This doesn't mean that the youtube analysis isn't useful, but it does highlight a difference in the mediums.