Review scores are also a bit offset. I have tried to give the absolute lowest to every metric booking.com gave me to rate and the resulting score was 2.5-ish. I was thinking about making a browser extension that rescales the values accordingly but I just made a mental note that a score 7 hotel is in fact a score 6. With this scaling the scores on the lower end gain more as a 3.3 score becomes a 5. Take this into acco…
I'd recommend staying away from hotels with very few reviews. But many (even smaller) hotels have several hundred reviews. They're usually very reliable.