I would agree that engagement is the biggest thing that's lacking right now. It's awesome for still being so new, but it would definitely be cool to see more people jumping in and joining with comments and photos. Something I'd love to see is a "My Build" type of space. Not sure if that's a group dedicated to build threads or a specific/personal tag or what, but it would be cool to be able to keep running tabs on builds I'm interested in watching/following without having to jump around from post to post.