Since the current Customer Review and Star Rating System of Assets in the store are insufficient in helping customers determine not just the quality of the product but the active support being provided, I am proposing an addition to it. A Dynamic Rating System that is powered by the existing Customers of an Asset and the site activities of the Asset Publisher which are related to providing support. I'm unsure if the current Asset Rating System has dynamic features but I noticed since the "Stars" don't get reduced even after some time, it can show inaccuracies.
To make this new system work, it might be required for the Asset Store to have an integrated Support Ticketing System that must be used by the Asset Publisher to provide help and assistance to their Customers. Like ordinary Online Ticketing Systems, the Customer is then required to post a Star Rating of their experience and maybe also an optional brief public note. An API can also be provided if needed to enable Asset Publishers to embed this Unity Asset Ticketing System into their own websites if they want.
The data gathered from this Asset Ticketing System can then be used by the Unity Asset Store to dynamically control the online exposure and presence of an Asset within the Unity Asset Store. For example, if the Asset Publisher's provided support for a particular Asset has garnered a high rating, it can appear more prominently and frequently in the front page of the Unity Asset Store and E-newsletters, can assist in determining if Asset can be a valid candidate for "absorption" into Unity's system, etc.
To further expand the usefulness of this new rating system, it might also be good to consider having sort of an "Asset Ease of Use Checklist" by flagging the Assets that have updated Documentation, and Tutorials... which will affect the Asset's overall rating.
With this approach, not only will Unity be building more confidence for Asset buyers but this will also help in the automation process in "cleaning up" Assets that are not up to par with Unity's high standards? :-)