We’ve camped a few times at Del Valle and will be back again this summer. Our experiences have all been positive. Our first time was by the main gate (in the 60s) and it was nice site with good shade. The last time was site 81, which had much less shade but a location we preferred. The bathrooms were brand new then so we really enjoyed those. Campsites are nicely sized, though “partial shade” kinda means not at all shady (be sure to bring your own shade). You have to drive to the lake but it’s not too long of a car ride. Parking and beach fill up quickly. Surprisingly very few bugs at the campsites during the day; nighttime is a different story. It’s a kind of bring-your-own-fun camping experience; great easy location for group camping and getting to bond with the people you came with.
UPDATE: stayed here for our 3rd time this weekend (June 2019). We had a great time overall. The line of cars just to get into the park was long and took over 30 minutes. Park was crowded but bathrooms were very clean (that’s always been our experience here). Helpful rangers came around to tell us about special programs (campfire program Saturday night and nature hike Sunday morning). The store staff drove around late Saturday afternoon in a truck that sold firewood; they didn’t come back around Sunday morning so be sure to grab enough when you see them.
2 adults and 1 kid in the basic cabin over Easter weekend a few years ago. We really enjoyed our stay and the property. Petting zoo animals were adorable. Nice location to Yosemite. Friendly interactions with staff.