I stay analizing and any other game (of survival well concepted) not have a system of skills like in unturned, in max a system to craft. and his dont have idea how hard is unlock the itens!!
but i stay viewing in unturned 4x the advantages stay in clothes!
a good clothe give less blood decal, a good armor give less damage per bullet, a good glove reduce the recoil and maybe increase the time of reload,
thinking in this style maybe the concept of skills stay abandoned and physic materials take the scene to new advantages
-HOW MORE YOU PLAY MORE OP YOU IS-
is just a think to discut why you think about this?