Quote - If you can't say something nice or at least constructive, STFU!

That's very funny because "STFU" doesn't seem nice or constructive. : ) For the most part I agree with you, it takes away from your own personal time to leave comments so anyone who makes a comment like that is doing it to gets something out of it. Some kind of sadistic pleasure by denying someone else the joyful pleasure of feedback. In the right context, bad feedback can be great to get, more valuable even.