You referring to the overall and the norm quality does not clear out the fact that individual quality and opinion is an extremely differing factor which is the main subject of this post.

I can like something that you don't like, its this simple.

The point isn't about the norm, which is what you're clarifying. If 200 people like a burger and 100 people dislike it the burger isn't "good" because a person who tastes the burger would have a 50% chance of liking or disliking it.

This is why we have a review system with people explaining their experience about the said item. People clarify the parts they like and the one they dislike. This is why the movie critics and other critics write massive posts over why they disliked or liked a particular subject because the reader can read it to judge over his own opinion.