I wish I could level up some things by doing, but I don't mind a skill tree also. I just wish they'd get rid of the level requirements. If i wanna dump all my skill points into one perk then let me. There is already an attribute requirement for the perks no need for level requirements too. I think that can help with stamina complaints because you now have the choice to level up the necessary perks for stamina. Also, it seems like zombies always always always know where I am for some reason. I don't mind the difficulty because i'm still playing on insane but if u startle one zombie then the who