Genuine question.
Why are you in a review thread if reviews do not matter to you? Like, I'm not playing "Gotcha!" or anything, I'm really curious, because lots of people do this.
If the game were getting great reviews, would your response still be "Yeah, but reviews are dumb, I'm still going to play this and decide for myself because I'm hyped for it." (Mind you, I also think the sentiment of "I decide for myself" combined with "I am already hyped for this game" ends up strange together, but eh).
If so, if you really would come in here under different results to state the same thing, then why? What point did you make other than simply planting your flag that nothing and no one will dissuade you from what you've already decided?
I don't think review threads are dumb, but I do often see the need to form my own opinion. I click review threads out of curiosity.
Just to bring up the Alien Isolation example again -- If I listened to the professional reviewers at IGN and polygon, I'd think it's a 5/10 game or whatever it is they gave it. In fact, it was my game of the year, and I'd easily give it a 9/10.