I think reviews are legitimate impressions but reviewers also literally have to play the game (except in Polygon's case where they decide to not do their job). If it's a game they have no interest in to begin with that can create a bit of resentment naturally. Additionally it means they're under pressure to finish the game as fast as possible in order to move on to the next one. This means they aren't always playing in the same way the average person would, or exploring all the game has to offer. Typically their job is to just get to the credits unless there's a major multiplayer component, and in this game's case getting to the credits does not showcase all of the levels. I'm generalizing of course, some reviews out there do more fully explore a game before putting out a review. But I understand the general distrust of review scores (except when they're reaffirming what people already wanted to think of course lol).
I personally do find longer term impressions much more valuable and I'm waiting to see how it all hashes out. I don't think buying on day one is a necessity. This way there will be enough genuine impressions not colored by "hype" or whatever.