I agree. When something gets a really positive buzz, people look at the response in a generalised sort of way and complain about that thing being over-rated. What they are actually doing is implicitly suggesting that each of those individual critics must have had wrong opinions, or that they secretly didn't think the work was great and lied in their reviews. Either is insane.
The only circumstance in which something is over-rated is when it is selected for accolades or awards for reasons other than the actual merits of the movie. Academy awards, for instance, are super political in how they are given out to actors and movies. They give out supporting actor awards to the leading actors in movies, because they don't want to use up the best actor award they've already decided to give to someone (who in turn, is being rewarded for one of their weaker movies, as they're overdue at least some award). It's one of the many reasons Academy awards aren't worth a damn.