Meh
Big campground and lots of noise, but lots of amenities. Probably good for families who want an easy trip, but not great for those wanting to escape the Yellowstone crowds.
The best campground in Yellowstone
Absolutely the best campground in Yellowstone. Quiet (no generators), out of the way, and in the incredible Lamar Valley.
Hard to get a spot so you have to arrive at 5:30ish in the morning as there are only 16 campsites. But, it is worth it.
Best time is early/mid July to avoid run off on Slough Creek.