I’ve camped here many times and the only bad experiences have been due to other campers, not anything with the park.
The proximity to the river can make some sites quite humid, which means winter camping can get very cold. There’s a good bit of bare dirt at the primitive sites, but the drainage is great so any mud dries out pretty quickly.
Beware the raccoons: they’re very bold and will happily haul off food… or anything else you leave out overnight. Also be aware of the bees - there are a LOT of them, which is nerve wracking if you’re allergic.