I believe it would be an asset to the site to have the ability to rate groups similar to the rating scale currently on individual manga. While I am aware that there is a function to follow groups, and a function to block translations by certain groups, it's a very binary position. In my experience, blocking tends to be reserved for groups who are controversial as opposed to the quality of their scans, on the other hand, you don't follow a scanlation group because their quality is good, you usually follow them because the type of manga they scanlate falls in line with your tastes for what you're looking for. At least in the general sense.
Meanwhile, there are plenty of groups translating projects you may be interested in, but while the manga may be good, their actual scanlation may be detrimental to the material itself. In the current system, all I can really do is leave a rating on the manga's page for how good it is, but just because a groups translation is awful doesn't mean that the manga itself is awful. With a rating system, it would make it easier to discern what groups really put a lot of effort and good work into their scanlations, and put out groups that don't really care about the material, and just do minimum machine translation and copy and paste.
Meanwhile, there are plenty of groups translating projects you may be interested in, but while the manga may be good, their actual scanlation may be detrimental to the material itself. In the current system, all I can really do is leave a rating on the manga's page for how good it is, but just because a groups translation is awful doesn't mean that the manga itself is awful. With a rating system, it would make it easier to discern what groups really put a lot of effort and good work into their scanlations, and put out groups that don't really care about the material, and just do minimum machine translation and copy and paste.