I dont agree with that statement at all. There are plenty of incredible movies that get slatered because they just don't understand them. 2001 a space odyssey for instance is an incredible movie, but a lot of people just dont get it and so rate and being "shit" or "overrated"
First of all, 2001 has a 96% on Rotten Tomatoes. Bad example. We're not talking about AVERAGE MOVIE GOER, we're talking about professional reviewers here.
A rule of thumb, don't listen to someone else opinion of something. Judge it for yourselves because reviewers can be some the most obnoxious and arrogant people out there and I really don't want to be told what's good and what's not by anyone :/
Also this is exactly why Rotten Tomatoes' system is good! It's a review aggregate, so instead of just reading one review and coming to a conclusion based on that, you can read a lot of reviews from a lot of professional reviewers and come to a conclusion ON YOUR OWN (wha...what...). There's nothing wrong with reading a review to help decide if you want to see a movie or not. That's what reviews are for.
Obviously a reviewer isn't going to be "right" about a movie every time, so that's why you want to gather a lot of opinions and come to your own conclusion. Sometimes that can save you ten bucks.