The review was overall very positive. Why just 8.0?

@griffy2013 It's "World War Z". And it's based on a book that was published in 2006, way before this or Day Z.

A 95% positive review, yet a score of 6.5? I don't get it.

Looking at single player only, other than bullet time and the jumping move, how is this game any different from Kayne & Lynch (which always received terrible reviews)?