People don't generally make things up.
I disagree. I think many judges are overzealous in their searches to find some way to use their knowledge to find "flaws" that don't even exist. They might be afraid to say "this beer tastes great to me" and score it a 42 when it deserves a 42, because they figure they must be missing something if it tastes THAT good, because 42s have historically been relatively rare. Many judges decide consciously or subconsciously that they should try to be hypercritical of whatever aspects they don't fully understand, whether it be DMS or diacetyl or acetaldehyde or anything else, in an attempt to hide the fact that they truly don't fully understand it. They want to look like they know what they're talking about, especially if they have rank at Recognized or above. Yes, this is very unfortunate, but I believe it to be true.
I am Certified, by the way. I do hope that this phenomenon is far less common with Certifieds and above. But of course, we may never really know. Some folks are better than others at looking like they know what they're talking about even if they don't.
Don't take my word for it, either. Go ahead and come to your own conclusions.