I found the game boring as hell- I know luck was nice to me, as I had a full roster of Survivors after area 1, and only lost 3 to god knows what (I assume those monsters that never attack the house, cause how in the world could you die to those damn things lol). I found defending extremely easy, and the only thing that warranted any attention was the crossbow, which was actually fun to use- for 2 defenses, at which I had a better gun.
Famas was a joke, hell, every other weapon compared to the AK was a joke. The headshots are not terribly responsive, as I've gotten them off body shots off the mario zombies. I only used the gimmicky instagib space bar move twice, and that was to spray the yard helplessly and see how many I downed in one clip of random fire.
I never got hit, hell, the only time they got close was due to the Famas' MASSIVE sprite being in the way. Then it was just point, click, win.
I dont know, the games too boring to just be a rehash of the first one. I didn't see anything really different, though its been a while. Upgrades seemed useless, never even bothered with them as they just didn't apply or never worked right.
Next time, have the option of being a defender or a search party member who has to actually search the areas of the home, while shooting out a window or something.