My two cents:
I'm new here, I read this whole thread, it was illuminating. The first guy, I'm thinking that's what OP refers to, had a concern to which the first couple pages or so of replies were addressed rather reasonably by several other people. The OP wouldn't or couldn't accept any of the explanations and continued to hold onto his opinion but expressing it in ever stronger and more over the top tones until he was in a full blown rant. He may have felt ganged up on and just gotten defensive about it and lost some control. After a few more pages of replies of mostly people making fun of him he did more or less apologize but the other people seemed to not see that and just kept piling on. That's when I started feeling a little sympathy for him.
The reason I started reading this thread in the first place is because I just got back the first two books I ever submitted to CGC and was disappointed with the grades assigned to them. I thought because I had bought the books myself off the newsstands and comic book racks of local stores and stored them away without ever opening them much less actually reading them that they would come back with NM grades, not the shockingly low in my opionion 7.0 and 9.0 grades given. After reading this thread though, I understand more about why they didn't get the higher grades I had hoped for and accepting the lower grades they got is a bit easier now. I still hope that the other 8 books I submitted will grade high but if they don't I will just accept it for what it is since it has been made chrystally clear that CGC knows what it is doing and is the accepted standard in this hobby.
Thank you to everyone who posted in this thread.