The "lack of context" is actually kind of a good point. I do think it's a bit odd that people can upload just any old photo from the web with no attributions. A lot of the pictures in the gallery are just random pictures seemingly pulled from the web, not pictures of anyone on the forum. We have no way of knowing where some of these photos came from, what the context is, and whether the person pictured is okay with the photo being used in that context. This is especially an ethical problem in the case of pictures with children, but I think it applies to all photos. I vaguely recall a brief debate a few years ago over whether one photo in the gallery depicted a well-known pornstar and whether that made it okay to host in the gallery, and another debate over whether a photo of some kids at a resort had been photoshopped. These are issues that would be way easier to sort out if we simply knew where all the photos originated from. I recognize that that's a ton of work, but if there is an issue with the gallery as it exists, I think it's a lack of attribution.
The gallery is still an important part of the site, particularly the "personal photos" section, and the issue is mitigated somewhat by the fact that access to the gallery is restricted. But I do think a bit more effort to show where images come from would go a long way.