My only real complaint as a Support main, is the hypocrisy around the fact that people will refuse the role because they can't carry, or don't have an impact in the team's ability to win, yet complain when support actually have that power to impact the team.
If Janna is OP because of a 56% win rate, you still have one option, the ban. And that's my real measure of a supports worth. Supports should have comparable impact on the team, so having comparable ban rates should be justified. Yet people would rather nerf them to the ground so they don't have to. (Cause apparently, spending a ban on a support is a waste)