I never look at aggregate scores (unless, I suppose the score is "one star"). Instead I read individual reviews, and keep reading until I'm reasonably confident I'm seeing a consistent pattern (either good or bad). This is time consuming but seems to work for me. One example of why this approach is necessary: very often people will give a restaurant a low score with a comment like "Way overpriced" or "Portions too small". Well, I actually want to pay more money if I get significantly better food (often, but not always, there is correlation), and I don't really care for huge portions.