Not that this is the perfect fix, but at least for sci-fi books you can usually look the Hugo Award winners[0] for ones that are solid. Not all of them are my cup of tea, but I have found that I definitely love some of the series that are found there. I'm sure there are other award types per genre that could help point you to some as well. Not that these can't be gamed, or sponsored or whatever, but at least it is a good starting point that is (¿maybe?) less prone to bot bias campaigns.
[0] https://en.wikipedia.org/wiki/Hugo_Award_for_Best_Novel