Spoiler Alert! Don't read if you haven't finished the show. Having read all the books doesn't count.
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I would definitely have given a 5 if the ending wasn't such a mess. They had created this wonderful pacing and ambience through episode 4 and 2/3rds. Then they for some reason decided they were making a Hollywood action film. Car chases! Drunk Cops Driving! Very bad cops shooting good cops!
Remarkably unsatisfying ending to what had been a great show.