I understand where you're coming from and I feel that in this forum we provide both critique and encouragement. I don't think I've seen many posts here that don't have at least one suggestion for improvement. Now as for the gallery, that's out of our hands really. It's just too big.  Too many people and it's impossible to go in and tell every one of them to give some critique. Besides, some artists here are writers and some are just hobbyists. To them, it's entirely possible that  a box with a fancy material and cool lighting would be considered a masterpiece because it's beyond their ability to understand how it was done. So we can't really police people into critiquing. We can only do it ourselves and hope we set an example for others, while doing our best to aide our fellow artists.

Also, you can critique without being "hard". The open hand works both to help and to hurt, the closed fist only can hurt.