I don't know what the hell this is... but it's wank.
The people on my local cesspool of wank (AKA Friends of Josh Groban - I've told them they're becoming a legend over here and they don't even seem to care) are talking about constructive criticism. But not for fanfics, fortunately... I don't think I could take an "OMG, U CRUSHED MY SOUL BY FLAMING MY MARY-SUE" wank in Grobania... no, no. They're talking about whether it's okay to say that you thought a concert was less than perfect, and if so, whether one should have to do so in a 'constructive' manner. If that sounds weird... that's because it is.
As usual, I have archived the (exceedingly colourful) wank for you to peruse at your leisure. I think my favourite part is where the OP starts talking about the tao of criticism.
Page One
Page Two
Page Three
Page Four