Let's not lose focus here and make everybody be overly complex about what they say though. If one's only two-cents is "I think the anatomy on the back needs to be adjusted to compensate for the new head." and it's pointing out an entirely blatant mistake that has been overlooked, wouldn't it be wasteful to force the critic to go on? It's poor practice to add fluff into writing--I mean sure, for those writing assignments with word-count requirements, who doesn't add fluff?--but I think we should strive to be concise, as being so does translate into the pixel environment (using 8 colors to do the Mona Lisa opposed to using 256-color gradients).
I vote that the whole 'one-liner deletion' reaction should be modified to include a review of content before deletion. I hate the omg-post as much as the next forum reader, but I'm a big fan of hard-hitting, blunt comments.