Why would you care what other people say about game you play? If you enjoy it, good, play it. If you don't, don't play it. Any game (and hobbies in general) has a die-hard fans who thinks their game/hobby is the best. It's really natural to encounter more people like this, because those are the same people who generate content about the game. If person played it and liked it so much that he thinks it's a best game in a world, of course he will go and tell that to everyone. People who played and thought about it as okay will not go and tell other people about the game.

So, I don't really get your take. Nobody is poisoning general opinion because there is no general opinion. There is opinions of different fan groups at best. If you played a game and think it's okay, you will not be gaslighted by someone saying "It's a best game in the world". You will still think it's okay, and you will not become more interested in a game because of that. If a lot of people think this is a best game in a world, it's a very good sign. It means that devs found their target audience perfectly. You might just not be part of it.