Most reviewers has played the game for a couple of hours. They have not really learned to play the game and get good at it. They do not know, if its has a lasting playability, or if its contains many hidden bugs thats not visible from just trying out the game. The less they play the game, the faster they can send out a review to their subscribers. Cause in this world, it's all about being first to get the views.
So most reviews is about the first few parts of the game. The initial visual effects and how you are introduced to the game. Maybe as long as the first 3rd of the game.
The goal of the publisher/developers of the game is to create hype. So that so many as possible buy the game from start. So they can get back the investments into the game asap. For that, they need good game reviews. Alot of hype to build up press coverage. The game nees to bee mentioned in the press so more people hear about the game.
Many follow the hype. Wants to be the first among their friends who has the new cool game. So they buy into the game and are the first to play it. This does not have to be AAA games from AAA developers, it can also be indie games like "No Mans Sky". Who might be a good and innovative game, but in the end is not maybe all what it was said it should be. That is also true for alot of AAA games. But they sell more since its a big publisher behind it.
Those wanting to be first to review the game or play the game is actually like the people posting "First post" on message forums. They seek to be notorious but noone really likes them for it. What people really want is good review who give a good understanding of the game and its underlaying mechanics. At least if you are a serious gamer who is in it for playing the game and not someone who does it to be in the incrowd and be cool among your friends.
Well, the game makers who take their money for it, love them. Then they go back to the drawin board to make the next AAA title. Actually most developers of games does it for the love of games. For the fun of playing games and making them. It's just so they need the money to pay the bills for the next big game.
Many game don't stand the test of time. Other do. Its hard to know which ones who will unless you play the game for a longer period of time.