If you read my entry to worst experience camping and remembered that it was a KOA, that is a good measure of your memory. Being parked under an interstate grade is just not going to be a great night.
We have since stayed at a number or KOA, but usually as part of a rally. That does not count in my book. As we are travelers and not campers, what the campground (or crampground) has as amenities is not much of an issue. We don't carry a television, we don't need a game room and if there is a pool full of screaming unattended children, that is no value at all.
We had to have a place to spend the night once and I could not raise the office of where I had planned, so the KOA was next choice. We actually enjoyed it. There were kids in the pool - With Their Parents. There was a "No jumping after 6PM" rule too.
I could do that one again.
Matt