My only complaint about my most recent trip to Kennywood was that the lines for the Potato Patch were massive and when the line I was in had its register go down, we were told to go to the other lines, which meant having to go back to the back of the humongous lines and go through the entire wait AGAIN. We just passed and didn't even buy any fries anywhere else.
Otherwise, everything else was top-notch. Great rides. Good service at the pavilion.