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How I use Yelp reviews:

5-star, less than 100 reviews: probably paid for reviews. I've never been to a "bad" place in this category, but I usually avoid it unless it's the most appealing option, so my sample size is small

4+ star, 1000+ reviews: definitely not bad. i would rate every place ive been to in this category as good or excellent, although some are overpriced. all of my favorite places in the bay area fall between 4.0 and 4.5

3.5 star, 100+ reviews: possibly good, probably not bad. ill check reviews, if people are primarily complaining about service and not food, it's probably good. i never pick 3.5 places if it's somewhere i've never been before, but i won't veto one if someone else suggests it

3.5 star, less than 100 reviews: i avoid these completely. i've still never been to one

less than 3.5 stars, any number reviews: i also avoid these completely