Of course, it's true that complainers are over-represented on online forums, but my experience goes back to the days when there was nothing but AOL, Compuserve, and Usenet, and there has never been an outpouring of grief even remotely as severe as what we're seeing with SU5. Essentially no one has decent graphics, and those with literally unplayable sims are legion. I feel it's safe to say that the percentage of users who've suffered significant downgrades is massive. But even if it's not >50%, the horrendous severity of the dismantling described in the threads on flightsimulator.com (numbering in the thousands of posts) thoroughly justifies calling it a crime against PC users.
I did not impugn the veracity of those who are satisfied. By wondering if their descriptions are genuine, I'm wondering if most of them are users with antiquated hardware who had previous graphics that were so bad that they're thrilled with their increase in FPS and lack the frame of reference to even see the massive degradation in graphics. They seem never to include their specs or include screenshots of their own to justify their opinion, which almost invariably boils down to "I'm good. I like SU5."
(I believe that you, personally, did include screenshots, which gave me hope, so my suppositions about supporters of SU5 certainly do not include you.)