Since Launch extensions can be made by anybody, and there can be more than one Launch extension that does the same thing (for example, I believe as of right now there are like 4 extensions that build Adobe Analytics s.products value now), I think it is a good idea for extension to have a rating system. Products have customer ratings on them. Forum posts do, too. Browser extensions, etc. not a new concept in general; same principle applied to Launch extensions.
.josh