Most typically I find that the less experienced judges very obviously copy some of the results from higher ranked judges, and it drives me up the wall because I would prefer that each judge give me THEIR OWN impressions. I don't care at all about consensus, whether as an entrant or as a judge myself. If I got totally different results from two different judges, I'd be both shocked AND pleased.
I understand what you are talking about though too. I agree that less experienced judges can have a tendency to try to show off their knowledge, even to the point of their comments becoming absurd. Some judges detect diacetyl in every single beer they taste, whether it's actually there or not. Some judges will say every beer is oxidized and "probably better when it was fresher". On the other hand I also have seen a Master level judge who claimed he was able to detect astringency in the aroma. Yeah, right. Scoresheets like this just go straight into the recycle bin for me.
It is for many of these reasons, in part, that I enter very few competitions anymore these days. I enjoy judging, not saying I'm perfect at it either though, but I'd really rather judge than enter. I think I entered one a couple years ago. Some judges do an outstanding job, but they are few and far between IMO. One thing I can promise to anyone who receives a scoresheet from yours truly -- I actually wrote down what *I* tasted, and I didn't give a damn about what the guy sitting next to me wrote on his sheet. What you see is what I myself actually perceived. I sure wish more people would judge that way.