Jugom
Scavenger
I agree with pretty much everything you said, but specially with this.For an A+ we would like to see a slight adjustment in the frequency of the spitter.
When you're are just earning your badge, it's great being able to find them quick, but after you're done with it, the constant spawn of spitters and frostclaws starts getting just annoying.
Just driving my minibike through the desert and I get a desert spitter spawn in front of me every 100 meters or so.
If it were up to me, I'd change the challenge to kill just any zombie inside the biome, could be a much larger ammount, and leave the spitter and frostclaw (maybe even the flamy burnt and mutated tho I don't mind those) as a much beefier and rarer sort of field boss.