I ignore ratings because of that. They don't mean anything and I am guilty.
On Good Reads, I have given what is deemed as a trashy piece of writing 5 stars. At the same time, I have given Dune 1 star because the story was garbage.
So what is this 5 star rating? Some people say it is the experience, some say it is the writing style, others say it is the story telling, or the plot.
Lets also face it, when it comes to films, the news papers have their own agendas and personal commitments to other agencies. My film could be absolutely garbage, but since I dined with the Editor a few times, It gets 4/5 stars and then, it gets 4/5 stars because the rest of the population is told how to feel.
I would even say that this whole system of rating based on Stars or Likes can simply be removed. If a film is good, you will know about it. If a film has been watched 1000000 times more this weekend than another, base it on that if anything.