We've stayed in Hershey KOA over the Memorial Day weekend. The site was very clean and well-maintained. We've read the negative reviews for their staff. I don't see the reason. The staff we encountered was very kind and they were not rude at all. We arrived at night and the staff checked us in with a smile and they escorted us to our site. I did see the staff on golf carts and yes they did mention a rule or two on their site. But the rules were not unreasonable. But if you want a crazy party time and less restriction in exchange for less cleanness and quietness, this campground is probably not for you.
The playgrounds and mini golf were cute. My kids enjoyed spending time there. Also Hershey Park was within a short distance. Overall, we had a great time and we will definitely recommend Hershey KOA to our friends.