The review system is designed to help devs and Steam, not the community. You can't easily search for negative reviews, just "most helpful," and the devs and moderators can edit your review at their discretion. The review system has the appearance of a consumer advocacy system, but does not actually accomplish that. Stick to metacritic. If you see a bunch of positive reviews on Steam, it really means next to nothing when it comes to how much you will actually like the game.