That game will fall in the same category with Postal, Manhunt and a bunch of others. "Might be fun to play a bit and blow off steam or whatever ... but I would probably be bored after 30mins." > then the same guy (me) goes around killing thousands and thousands of things (also people) in other games. Difference being, those other games also had other actual content, besides killing things.
I did play most GTAs though. Usually I just end up causing as much destruction as I can for a couple of days, then actually play the storyline for a while, then trail off for whatever reason. Never finished one, for which I'm mildly ashamed. One "gory" game I have quite liked to play is Sniper Elite 2. I just wish someone would make an axis version of it. Killing nothing but germans gets old.