fireblade
Vincenzo.
A longer running image critique thread which may be of interest to some is over at the 'Hardcore Street Photography' flickr group (https://www.flickr.com/groups/onthestreet/discuss/72157637994366446/). I haven't followed in it in a while, but it often focused on the brutal side with very strong points of view about the acceptable range of content as well as the critique of the photo itself. If you want brutal, terse and occasionally nasty it is a decent thread to check out. Skimming the last few pages it looks like they mellowed out a bit recently.
Edit: Pointing out HCSPs thread because its a model of how I see 'brutal/brutal honesty' critique threads play out. While obviously some people get value from the one there - and there are certainly some good comments - they are often drown in less useful or ones seeping in personal content taste over more objective views.
i have followed HCSP from inception, and the idea of posting your image for critique if it does not make the main thread is good, and some of the mods were brutal, but truthful. If you follow the main thread and see what they allow, you will get the flow...then you see the ones who post their images that did not make the main page asking why and you can see it instantly. When one of those would start kicking the shed door not liking the critique they would get hammered by the mods, and they won't let up if you questioned it a second time....most walk away broken😀