Couple of years ago I went to Kings Dominion just outside of Richmond VA and 1/4 to 1/3 of the rides were shut down, the park was a mess. The year before that I went to the Six Flags outside DC and quite a few of the rides were out of service.
Don't know if they are owned by the same company, but I would never recommend any of them. Hershey Park and Busch Gardens always seem to be in tip-top shape.
I agree with YOU 100%! That is why we rarely go to amusement parks now. Disneyland is still OK but so crowded. The Six Flags parks do not do enough maintainance on their rides. They had one I think it was called the Batman Ride at Houston Astroworld (now defunct) where you had to remove earrings. Because the ride banged your head/ears into the sides of the headrest so hard that earrings would hurt you. It was a great ride when new, but instead of replacing the foam that surrounded the head/ears - they just made you take off earrings. They just didn’t do the maintainance and the rides got bumpier and even painful. The good old wooden rollercoaster was good though. They are supposed to be bumpy.
At Disneyworld last year we rode the ride that two people have died on. It simulates a landing on Mars. I swear if it had lasted one more second my chest would have exploded. It was too real.