Well, A&D has rules and, as always, no one is above them. It wouldn't matter if the post was two pages long or two words long; if the comment itself doesn't address the artist or the artist's work, it's deleted. Kraider's post could have (and in fact was) transplanted into many other galleries in A&D. Positive or not, it broke the rules.
Just so you know, I did contact Kraider after I deleted his posts (on April 29th) and encouraged him to resubmit a critique.
I will take your comment into consideration and I appreciate your input, so thank you. :)