I have played all 3 parts of this game and I liked it very much. Excellent and unique world building. Deep story with both humorous and dark red pill undertones. Great and interesting characters. Good art an character expressions. All the choices were meaningful and sound. Also I like the many medals to unlock.
Only reason the score is not perfect 5 stars is because of minor technicalities like lack of full screen and an animated cursor. These little technical things do give or take from the overall experience.
The story of the first part looks like just a detective story, but the unique zombie world is a nice unique setting and I liked the foreshadowing of the future events by hinting that the police commissioner is up to something.