>The anonymous crowdsourced rating and review system was designed for songs, where the only thing that matters is personal musical taste.

I think that's the core, but that's also the problem with all reviews, more so user reviews. I'm not sure there's an answer.

I've been getting into board games lately. It's the same problem even where the enthusiasts who you might think would be "better" reviewers are largely doing the ratings. But for a variety of reasons that I suspect, they're not that great at rating either ... the ratings trend towards the complex games and known popular games / styles. There's no good way to sort through them, lots of efforts have been made but I don't think anyone has figured it out.