Personally, I found the Wind Cave campsites small, cramped, overcrowded, and loud. We camped at the Sylvan Lake cg in Custer SP and found it the same plus not close to the lake and with no SP dump station for more than 20 miles. Our favorite cg wasn't even in the Black Hills. It was just SE of Hot Springs at Angostura State Recreation Area.
We drove the Needles section from Sylvan Lake to Mt. Rushmore in our truck and really enjoyed the scenic drive. But because we were almost alone with the herd, we enjoyed driving through the buffalo more at Wind Cave NP than at Custer SP (also just in the truck). And we loved the guided tour at Jewell Cave NM, while the Wind Cave tour was just so-so.
All-in-all, we enjoyed the Black Hills, but some sights and campgrounds were obviously better than others for us. Fortunately, not everyone likes the same things we like.
"Retirement is the best job I ever had!"
2015 RAM 2500 4x4 crewcab 6.7L CTD; 2016 Rockwood Signature UltraLite 5th wheel