Nothing wrong with this campground, per se...
The sites are large, and shadier than we'd have thought (we brought a patio umbrella all the way from Chicago and discovered our site was under a large pinion pine, go figure).
The pit toilets and the plumbed facilities are clean and maintained.
Open fires are not allowed.
But, we rarely saw anyone. One couple walking their dog and the camp host who we didn't meet until we were leaving. We joked that all the RV's were "Breaking Bad" meth labs, this being New Mexico. The sense of desolation is enhanced by the wind, the cawing of birds and occasional howls of coyotes or wolves (?). It was downright spooky.
Heron lake is currently at 25% capacity. Which means the boat ramp and marina are perhaps a mile from the current shoreline, dried up and one of the saddest sights you'll see.
However, it was a good base of operations for our trips to Chama to spend the day on the scenic railroad, as well as day trip into Taos.