Picked this up for my daughter (age 5), who's going through an obsession-with-anatomy phase.
I'm not in the medical fields myself, so I can't evaluate this the way that a physician or anatomist would. But from an outsider's perspective, I can definitely appreciate it as a work of scholarship and of art. I suspect it's a classic for good reason. Beautifully detailed and thorough illustrations. Gives me a lot better understanding of the body. And, more importantly, gives us something to show our daughter, every time she asks, "How does the heart work?" or "What's inside the neck?" or "How do toes work?" or "Where does the baby grow?" She's fascinated, which is neat to watch. (Though, apparently, the brain squicks her. Go figure.) I suspect that it will continue to offer fertile grounds for exploration for years to come.
My one gripe is that all the illustrations are of white people, all apparently in peak physical condition, all young, and mostly male. (E.g., except when female genitalia are involved.) To some extent, that's not a huge deal -- we really are all mostly the same under the skin, as far as I can tell. So "medically", that shouldn't matter. But it does feel like it contributes to establishing/reinforcing a strong social norm between what's "normal" and what's "unusual". The classic "self/other" dichotomy, encoded in a textbook used by most (all?) physicians trained in the US.