Just gonna chime in here - there are too many goddamn screamers way too early for doing so little activity. If I'm sitting on my ass, not making a sound, not even MOVING, no workstations running, why are there two screamers coming to welcome me to the neighborhood? They didn't even bring me a casserole!
And yet, in a city, at night, I can have a zombie nurse chasing me, then give up after I stop moving TEN FEET AWAY FROM HER. I didn't even crouch or hide behind anything - she just stopped and lost track of me. Zombies have some major ADHD issues in 1.0