For example, let us assume that you are starting an exciting new project and need to learn about the most prominent papers in the field of "antimatter". One may expect that there are some classic introductory texts, of very high quality that are obvious to people who have been working in the field for a while but are much less evident to outsiders like you. Googling may not always yield direct recommendation for the best text and you need to consult an expert. There are also some well-known in-depth and concise-but-exact-overview texts you need to know about.
What if there was a voting system on the best review in this specific field? Such a wikipedia of the most important papers in different subfields would be potentially of great use for everyone.
I would love to volunteer for managing of some sections as an experiment if that is of interest to you.