I had my son there. Also AMA but not high risk. I wanted to see a midwife, and ended up with one that was fantastic. As PP noted, though, scheduling can be an issue - if you're fine seeing whomever, you won't have a problem getting appointments. But if you want a specific provider, it can be difficult - when I had problems getting appointments with the midwife I ended up going to the patient advocate. You may need to be persistent. And for delivery you'll get whatever doctor is on duty (though that may be different if you're high risk). It's a training hospital, so many of the doctors involved are still residents or interns. I also had a c-section and the anesthesiologist and surgeon were both junior, but they were fully supervised by senior docs the whole time, and I had no concerns; I thought the delivery went well, and I was able to hold my son pretty quickly. When we did the L&D tour, the nurse who gave the tour was upfront about the fact that they do continuous monitoring of laboring moms and while they'll accept birth plans, they aren't particularly receptive to the Bradley method. I thought the post-delivery care was good - my chief complaint was that the lactation consultant on duty was bad. The hospital doesn't have a nursery - babies room with moms, which I liked but isn't for everyone. DH was able to stay in the room as well (we also live in VA, so the drive home would have been long). Overall we were pretty happy with the experience. We've stayed on for pediatric care as well.
There's definitely a unique aspect of being at Walter Reed - several of the medical personnel involved in my care had recent experiences in Iraq or Afghanistan. One medic told me the L&D ward was a nice change of pace.
As an aside, I went to the breastfeeding group at VHC after I had my son - definitely recommend it and their new parents group.