As others are saying, it is probably the fan base. However, I think another reason could be that lots of people who do say bad things about it are used to playing Xbox or Playstation, and Minecraft on console is terrible because all you can do is build really. (I hear Xbox have brought out some new features? But still) On PC, you have plugins and stuff which is what makes it a decent game, and most people start saying stuff about it before they even have a change to play it on PC.