I've never seen the term academic being likened fanboy.
Obviously I meant the exclusivist group of scholars, teachers and experts in their field whose evaluation of said work carries weight and trickles down to the general populace. Most people hear about LOTR and Citizen Kane being masterpieces before they had a chance to see it for themselves. Their reputation precedes them and the person builds up their expectation accordingly, then, for whatever reason, it fails to live up to those expectation.
This was the situation I meant and people gave examples. I didn't think it was necessary to go into details as to why it wasn't to their liking, but many have and that's great.
Edit: to repeat/clarify, this thread was NOT created to bash or criticize widely popular or acclaimed works, but to post about these instances where you picked up a piece of fiction BECAUSE it was widely popular or acclaimed or recommended etc only to find out it wasn't to your liking.