The phrase "sad commentary" means expressing a negative opinion or criticism about something, usually referring to a disappointing or unfortunate situation or state of affairs. Full definition
It is a very sad commentary on modern society. (bookbrowse.com)
It's simply a cultural difference but it's also a very sad commentary on our society. (voices.washingtonpost.com)
It's a rather sad commentary on the quality of teachers in Wisconsin's teacher unions, as they have apparently failed to teach their students something as simple as «when the money's gone, we're broke!» (utahpubliceducation.org)