I left this comment on Pascal's post on make.wordpress.org:

"This is such a great idea.

Pascal, I wonder if it would be possible to integrate within the Shiny Updates, a “one click” solution so users can rate their installed plugins.

I mean, some two to three days after the user had installed the plugin, your interface would show the five star button that’s available on the plugin repository in wordpreess.org, so users would only have to click in there, and the plugin rating would be updated in the repository immediately.
(Eventually, a text field would open next, so the user could writesome words regarding his/her opinion telling why had chosen to rate the plugin the way it rated on the stars button.)

You see, when someone needs to go to wordpress.org searching for plugins, it is so strange to see that most of plugins have thousands of installs but the vast majority only get few tens (well, some get few hundreds, but that is really rare) of ratings.

That is just not good. Something is not working well on the plugin rating scheme nowadays.

Your solution would be the best thing that plugin rating could get to increase a bit more the precious information that one needs to get when a search for a new plugin is on our way on the repository.

Thank you so very much for all your precious work."

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Although, it seems that his project is not directed to this approach, Pascal liked the idea! He said:

"Thanks for your feedback!

Shiny Updates are unrelated to plugin ratings, but I like the idea. This needs some work on the w.org side of things though, as it can only be implemented when users can connect their blog to WordPress.org. That way users could easily rate plugins and themes and mark plugins as favorites as well. Definitely worth pursuing."

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I guess I will make a bit more "noise" with this idea of mine on other places where it could turn into a feature on WordPress core, who knows?