There is no objective way of knowing the demand for the various missions they fulfill. There are pretty good anecdotal and other ways of assessing to what extent they're doing their job well, and there's a very mixed review, with some existing commissioners doing outstanding work historically and others being part of patronage heaven.
But even the outstanding work is a problem. Even if they were all outstanding, we have a problem, and that is the very strange situation where they're below but don't report to the senior people. That is so absurd.