I was a member of DM for a few months.. it was very enlightening.. the vast majority of the comments were of a technical nature, mostly, I think, because that's all that most flickr members can express.. artistic feelings and artistic merit elude them
and because it's a dynamic group (different people joining and leaving constantly) they refer mostly to technical skills.. eventually, I left the group because it offered nothing new for me.. I learned the concept of composition and technical competence, which is what that group concentrates on.. to them, the epitome of great photography is mastering the art of 'fill flash'