Great points. Does Steam get around this slightly by having different tags intended for meme reviews? I.e. I think I’ve seen ‘10 people said this review made them laugh’ or something along those lines. That at least makes it a bit easier to filter out the ‘actual’ reviews. I wonder if the cumulative total (on both Steam and Goodreads) averages out the joke/genuine reviews, assuming that a) enough people have left a review and b) there hasn’t been any review bombing.
And yeah there are plenty of books, games and shows out there that I’ve absolutely loved but they’ve been reviewed terribly by professional reviewers. I think on the whole people assign too much weight to arbitrary totals - “Oh this book is a 6/10 so I shouldn’t waste my time on it”. But if you think like this, you’ll miss out on so much.
Picking out parts of reviews that you find relevant is a good idea; your enjoyment of any kind of media is subjective and therefore unique to every person. I guess if you can find a particular reviewer with similar tastes, who also happens to have read a lot of the books you’re interested in, their reviews could be a good indicator of whether you’ll enjoy a book. And yes a 4 tends to be my baseline for book reviews; anything less and I didn’t enjoy it that much. 5 is pretty much perfect.
Over-analysis is definitely an issue. It’s inappropriate a lot of the time like you say. Writing a good review is tricky! You have to take into account the target audience, when it was written, whether it’s part of a larger series and so on. Authors and readers are too often obsessed with their overall rating for a book, but the real indicator is what people have actually written in genuine reviews, and whether you agree with that opinion. Unfortunately websites like Goodreads don’t make those reviews easy to find.