Speaking of bad reviews there's always the great ones which are: "I know this game isn't meant for me, and I don't like the game's main fetishes, but I'ma review it anyway and give it one star".
You don't need to review every game out there, there are a few games I've played on this site and have deleted from my hd not too long after unzipping them, but it's usually just cos they're not games I'd ever enjoy.
Imo the only real reason to give a game a one-star review is if it is being deceptive or agressively terrible, like throwing ads in your face or claiming to have tags that it doesn't fulfil (or not declaring important tags, especially the dreaded three letter tag)
One-star reviews are usually just as useless as someone giving a five-star and just filling the minimum characters with stuff that doesn't actually help people decide whether to play said game.
Reviews should be there to help people get a general understanding of the quality of the game if they have already been drawn in by something.
Saying that, I can't remember what game it was (could have been motherless?) but a one-star review actually made me play a game here once as everything they put in the "cons" section of their "review" was something I wanted
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