Bad umping hurts the players because they don't know what to swing at and what not to. A bad strike zone, if consistent, is OK because the players at least have an idea of what to do.
My son had the longest home run in high school history Tuesday at Maine East. He hit it over the wall. The left fielder told the ump that he thought the ball went under the fence. The umps conferred and sent my son back to second for a ground rule double. Our coach went out and said they should find thhe ball. The umps went out to find the ball over the fence. It was obviously so far past the fence it couldn't have gone under. They conferred some more and called it a home run. It tokk almost 15 minutes for my son to round the bases. The longest home run ever. I said longest, not farthest.