We were actually toying with the idea of showing vertical lines for releases on the various charts. So for example: # of open issues over time, and you can see if it correlates with a major release.

Identifying user satisfaction automatically is more tricky (sentiment analysis, which would be amazing, but we don't have the resources to do that well).

For now, one of the things we might do is to ask people to specify a version whenever they rate/review a package (or somehow deduce that automatically based on the date of review, which would not be as accurate...)