How do you use the 5 Star rating system to make a decision?

Do you have number, such as 80% 4˜… or above with 70% being 5˜…, or
something like that?

Obviously, we have to toss the irrelevant reviews like:

2˜… - I bought this for my daughter and she hates the color.
1˜… - This sink doesn't fit in the hole I have in my counter.

But in general, do you have a "system" or is it just gut feel after
reviewing the reviews?