The idea is good, but it gets worse later on.
I haven't been able to hold on the any ammo or medkits for more than 32 seconds, because of all the random super zombie attacks, because there is no way to kill them. I haven't been able to find a melee weapon for around 350 days, and now the zombies take 4 hits to kill. Combined with the fact that I can't hold ammo, I have to flee every time, even though I have like level 15 armor. Then the doctor whatever her name is appears every time I rest, or a couple searches after the last time, making her often useless.
If the super zombie attacks could become less frequent, or less severe (lose less ammo), and the amount of melee weapons you can get goes up, it would make it a lot better.