Ripli based on this information I would say that the lower end weapons damage should be increased I myself tried killing a zombie with a screwdriver recently this however took much longer than expected 3-4 hits would be acceptable in my opinion without making the game too easy as I have read that more zombies will be spawning in future patches.

It is feedback and has been posted in the feedback section as per.

I am aware this could also be lag with the zombies which I did not think about until now as in several cases hit detection has been a bit off with zombies clipping through the walls and floor.