As for me zombies were good. It wansn't annoying like a lot of ppl said (they said same thing even before they started to hear that well). Zedz became really hard, and it brought some chanlange to the game. Nobody isn't going to bring that back ofc (partly because of some youtubers already released their videos), but thaking the "good hearing" script part and creating sepparate class of more dangerous zedz on its base would be nice.