Some statistics based on our reviews:

The total number of reviews is 74.

The mean score (average) is -4.16. (Why isn't it 5?)

The median score (middle) is -4.

The mode score (most common) is -3.

The standard deviation is 1.867.

For more statistics you can see this data on Wolfram Alpha.

Using Google Charts we can draw the following graph of score frequency:

To understand how our scoring system works read the Score Breakdown.