I treat reviews mainly as informative pieces of text that are also entertaining to read. I also take into account the opinion of the reviewer, depending on how well I think it reflects my own opinion. However, I don't generally make decisions based on reviews alone.
Also, I think a review scale ranging from 0 or 1 to 5 is the best, simply because the difference between a game that gets 89 and a game that gets 90 is not very meaningful, and a smaller scale hides that difference. Also, whenever I see these smaller scales, they usually seem to get utilized more thoroughly, meaning the lower range is not completely ignored like it usually is with the scale from 0 to 100.







