Trying to find a truly unbiased review is a bit like hunting for a unicorn, isn't it? Everyone brings their own history and preferences to the page. What I've settled for is aggregating a bunch of sources and looking for patterns. I read the two-star reviews on Amazon or Goodreads—they often have the most concrete, non-fanboy critiques about pacing or plot holes. Then I'll cross-check with publications like The New York Times Book Review or The Guardian, knowing they have their own literary biases but often articulate them well.
Forums are a whole other beast. Subreddits for specific genres, like r/Fantasy or r/TrueLit, can be goldmines because the regulars there have read everything. You'll get comparisons like, 'If you thought the magic system in 'Mistborn' was rigid, wait till you see how this author handwaves it away.' That kind of niche, comparative analysis feels more substantive than a star rating. The bias is still there, but it's the bias of an informed, passionate community, which is different from a random blogger trying to get clicks. I just avoid YouTube 'booktube' for this purpose—it's all about personality and aesthetics, not critique.
Ultimately, I think 'unbiased' is the wrong target. I look for reviewers who are transparent about their tastes. If someone starts a review with 'I normally hate cozy mysteries, but...' that's incredibly useful data. You learn to calibrate your own meter against theirs.