EDIT: 6 hour update
mission structure is insanely repetitive.
weapons are not very varied.
melee kill animations (while satisfying) are not varied enough to keep the satisfaction rolling.
story and writing continues to impress.
not much to explore in the city, basically driving from this "kill everyone" mission to another "kill everyone" mission.
I initially loved the collectibles, but now I'm realizing the only incentive for me to explore the boring buildings of the city is to see naked girls in the playboy magazines
3 hours = 'holy shit this is amazing', 6 hours = 'I wish there wasn't so much gameplay in between story beats'