We loved our 4-night stay in Big Meadows. I definitely recommend booking a site on the outer part of the loop, or one of the walk-in sites, if you are tent camping. A lot of the interior sites seemed very close together, but the farther out you get, the more spaced out they seemed to be, we could see a couple of other campsites from ours but generally felt we had plenty of space and privacy.

Campsite facilities seemed pretty clean and well-maintained, and there is the campstore at the front of the campground with necessities, laundry and shower (for a fee). And if you need more the Big Meadow visitor center, and Wayside souvenir store/snack bar are just a mile or so from the campground where it meets Skyline Drive. They even have a gas station there. We went and did several hikes, including Dark Hollow Falls, and spent a late evening in the Big Meadow on a picnic blanket stargazing, all very close to the campground.

Bear boxes are big and sturdy, fire pits are on the smallish side but fine. Honestly this place is pretty tough to beat in terms of facilities, value, and proximity to a lot of beautiful and fun national park hikes and sights.

Spent 4 nights here (during a heat wave, no less) and really enjoyed it. Campsites are large and not right on top of each other, and especially if you can book one of the campsites that are on the water, they really do have beautiful views (see pictures).

Pros: 

Kid-friendly. We spent an afternoon at the splash pad, which is a great way to cool off in the summer and free once you're in the park. I never felt unsafe with my kids running around up to the bath-house or the loop, felt very secluded and safe.

Lake is scenic, we saw fireflies at dusk, it was a great setting for a camping trip.

Everything seems pretty well-maintained. Bathrooms are aging but were cleaned at least once a day, it was fine. There is firewood at every bathhouse you can take on the honor system and pay for via cashbox, which is nice. Campsites are clean and well-maintained.

Lots of lake recreation options (boat rental, fishing, etc.) in or near the park. 

Cons:

Maybe it was just our campsite, which backed up to a large wooded area, but they were the most aggressive squirrels I've ever come across. If we went to the bathroom for five minutes and left food on the table, the squirrels would be there eating it when we came back. And would hover at the edge of the campsite or get into the car if the hatchback was open.

Camp store is….fine, pretty minimal in terms of provisions. But not a big deal because Clarksville is five minutes or so away and has plenty of stores.

Tents pads are all gravel. Didn't bother us but definitely would not want to tent camp here if you didn't have a good high-quality sleeping pad.

The biggest con was that there is no swimming area/beach in the park. You can try to wade in from the campsite but that generally requires scaling up/down some fairly treacherous rocks, and navigating driftwood and rocks in the water. We drove a few minutes away outside the park to find one, but would be really nice to have some kind of little swimming area inside the park, very strange to me they don't have one.

But all in all a lovely place for a camping trip, we all had a great time.

This is a fairly nice, bare bones NPS campground. If you are really looking for somewhere to feel far away from civilization and see some beautiful scenery, this probably isn't it. Helicopters and planes fly over regularly, and you can hear sirens from neighboring college park. The campsites are pretty close together, we could see probably about 10 or so other campsites from our campsite. And there is not a ton to do within the park itself -- there are a few picnic areas, a pretty unimpressive small playground, some nature/walking trails, and that's about it.

But it is a pretty nice campground -- campsites and showers seem clean and well maintained, bathrooms are fine and you're never far away from one. Rangers come around regularly to check on things and every one we interacted with was extremely friendly. I don't think there's anything comparable so close to DC, so if you're in the DC area and just want someplace close by for a short camping trip, or are looking for an affordable outdoors-y option to stay while you're visiting DC from out of town, this probably fits the bill. As soon as you leave the park you are in College Park with Metro access close by, and very close to the Baltimore-Washington Parkway.

Stayed here for Labor Day weekend and had a great time. Clean, well-maintained camp sites, well-stocked and friendly service at the camp store. My kids also LOVED the swimming lake -- especially great for small kids, because the roped-in part of the swimming lake only gets a few feet deep so you don't have to worry too much about them getting in over their heads. Bathroom and shower facilities were fine, and had a big sink you could use for cleaning/dishwashing.

The only downsides for us were that the campsites were relatively small, and close together. A couple campsites down from us was a big group that stayed up late socializing one night and we could hear them very clearly from our tent. And, while the swimming lake is great, it is crowded and you have to drive from the campsite to it (note that you do not need to wait in the long line of cars in the general public trying to get in, we just drove past them and showed the guard our camping receipt confirmation and got waved right through), and the parking fills up pretty early in the morning so you could end up without a spot. Similarly, the hike to the falls was a little crowded and underwhelming -- you also have to drive to that and park, and parking at the trailhead is very limited. 

The bottom line for us was that it's crowded enough that you do not really feel like you are out "in nature," but, especially with small kids, all the amenities and recreation make up for it.