The game is interesting at first sight but I am not into zombie-hacking stuff other than the Resident Evil series. But I did try playing L4D before but never liked it.
Just started playing this yesterday and I am somewhat enjoying it. It has a good overall feel to the game, going for that Fallout 3 sort-of-feel. I think the fighting engine is a bit buggy and not fluid or easy enough to use. But I have only played the game for 2 hours 8).