I usually download plugins by logging into the back-end of a WordPress site and adding plugins from the "add new" section.
If you run a search it the results are shown having the following columns
c) Rating and
It would give me more confidence to install a plugin if the last update date is mentioned in the results details as it will let me know if the plugin is being developed actively or has it been abandoned by the author. Another metric that would help is the number of downloads till date as the more the downloads the more confidence I will have to install the plugin particularly if I'm going to add the plugin to a live website. I do not mean that the new plugins should not be tried but the extra details do help in making a decision specially when you are working on a live website. These changes, I believe should be easy to implement as this information is already there as it is shown in the results if you run a search on the WordPress.org in the plugins section.
Fellow WordPress users if you agree with the suggestions please vote for it!