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There is only one that matters, which is if the game looks interesting to you. I would recommend reading a few negative reviews, and a few positive ones. Then if it looks interesting try it out. If it doesn't "wow" you in two hours, refund the game. If it was close, maybe check back later, if not, don't check back on it again.
While I hope you love the game, not everyone game is for everyone and that's okay. If you don't enjoy the experience, at least refund the game and hopefully check out other games we make in the future.