In the time I've been part of the SG community there have been a number of times where I have seen a model I think deserves to be pink in a set that I don't believe shows her to her absolute best. The idea of saying something discouraging to a model is heartbreaking, even more so if I think they are capable of much better, but I cringe at the idea of praising something I don't find praiseworthy because if no one ever sets higher expectations what is going to encourage the model to do better. In the end I say nothing.
I'm a photographer. I know my photos are not perfect. But I'd much rather someone give me honest advice on how it could be better than tell me a photo is wonderful when I know damn well it's not.