TBH you should ask the same if the games were made by big and famous companies also. The devs are people and they work hard to make those games.
That aside, IMO having a game rated 3 stars is better than no rating at all. At least someone consider the game good enough.
I'm fully aware that there might be trolls and fakers giving fake ratings + reviews but until I have proof, I'll consider ratings and reviews genuine.
OTOH how do you pick a game to play from a list of multiple games with no rating no review etc?