What they do have, however, is a significant attack boost over a Greenie.
3 dodge is enough to dodge inaccurate attacks, so those -1 and -2 matter, and those bonuses to attack rating count too. If you couldnt hit a zombie dog with it you cant honestly expect to hit a survivor zombie.
And, unlike a dog, they have the attack to pierce you modest early game armor. They are faster, and when you are under 100 speed, every point matters in getting more done.
But, imagine that you can hit a zombie for 20 damage. Zombies have 80 hp. 4 hits to kill 1 Zed.
Survivors have 100, which is an extra hit, but also take into account that 7 armor. Actually, chances are youre using a weapon with dual damage types. i.e. you sword does bashing and slashing damage, and the Zed armor can block up to 14 damage; 7 from each. So now you arent doing 20. Youre doing 6. 14-15 hits to kill. During which hes causing you pain and slowing you down even more by grabbing you.