I've been to Lake Lenwood several times in the past 4 years and each time have had the same experience. Yes, I've read the other reviews, and yes, the owner seems a bit strict on the rules. However, the place is generally spotless, the beach is well-maintained, the picnic area is clean and the lake has clean water. I have been many many other places that have had a looser set of rules and have been annoyed by loud families up until all hours of the night, have had my children overrun by unattended teenagers, and have been annoyed with garbage strewn about public areas. I have 4 children under the age of 9 and we camped with our friends who had 3 small children and who brought their dog. Our children are normal children and made normal amounts of kid noise. The owner was very friendly with us and was even complimentary about how well-behaved they'd been. He never made one comment that made us nervous about the dog. In the past, we've camped here with 2 other families and a total of 11 children and a dog on 3 adjacent sites--again, we had no problems. I have never had a problem with the rules, and I even appreciated them. I had one small instance where I thought the owner was a bit strict about where my car was parked, but we discussed it and it was no big deal. He and his wife were super-friendly to us, and I'm sure it's hard to run a place like this if you don't make the rules the same for everyone!
The playground facilities are what I would call a throw-back and were extremely well-maintained, not rusty or run down at all. My kids had a blast in The Tower, on the merry-go-round and in the big tube. The slide, diving board and water raft provided hours and hours of entertainment for them. We did dig on the beach a bit and were not reprimanded, and we were respectful after and just put the sand back in the hole--respecting the fact that they have just a small staff to care for the entire campground.
I would have liked 15 minutes of shower time personally (or at least 13--I barely made it!), and the water did smell a bit like eggs--pretty common of well-water, from what I remember. The shower/bathroom area could have used a bit better ventilation, but given the fact that this was camping, I was not looking for luxury!
My family and my friends decided we'd definitely be back.