Our paths may have crossed and I didn't like the cliques and tit for tat on critiques but there were some very helpful people there - quite possibly including you
People were generous and I learned a lot.
Consensus from past members including Sheena the admin was that it died partly because all such sites lost traffic and without traffic it was nothing, Sheena did become unpopular and people were always sniping, the owner of the site lost interest and would not develop it technically and to modernise, nor would he sell it to willing buyers.
So, it stagnated and looked old fashioned and lacked facilities that were simply expected by new users. Then there were down times and it relied on a senior VP in a big corporate to put his geek hat on in his spare time to kick it back into life and of course that slowly killed it as well. But the last down time just dragged on and it was never fixed. Nor did the owner declare it dead. I would have removed all my images given the chance.
I have found nothing comparable and probably its time has passed. No-one really wants to be told their image is flawed - well some say they do but if you do it, even with positive suggestions, you don't often get a positive response. All anyone wants is 'great image', 'Excellent', 'St Ansell couldn't do better', 'reminds me of HCB' etc. All people want is affirmation that what they are doing is wonderful and if that makes them content then that's fine by me but they won't grow.
All that said somewhat windily I still miss it and thought of it today again. Some of the characters there were great NixPix who was a very naughty person, MaxArt who was wonderfully abrasive but had a big heart, Evan Levaine who was so quietly creative (and now sadly dead) and a phalanx of others who gave help so willingly.
Mike