Is American Sniper a good biography?

Sorry if I say things wrong. I'm Dyslexic so sometimes I do that.

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My Film Rating System:

1/10 - Don't watch this film

2/10 - Awful

3/10 - Bad

4/10 - Not good at all

5/10 - Meh

6/10 - Okay

7/10 - Good

8/10 - Great

9/10 - Awesome

10/10 - Excelente

Bonus Rating System - F***** Up