I think additionally there is a large audience that reads reviews and other gaming news to be entertained more than to be informed.

It's fun to get hyped up and excited about some upcoming game, it's not that fun to read a review about a mediocre game.

And if you are largely going to make your purchasing decisions based on what your friends are doing anyway, or if a game isn't a super high-ticket item for you, then it's not something you really need to chase down professional reviews for.