mine craft
skeletons
skeletons are bad the shoot arrows at you and it sucks, but the good side is when you kill it it drops arrows and bones. and bones tame wolfs and you can make a bow. and if you read the creepers and endermen if it kills a creeper it drops a disks.
zombies
zombies are not that bad they just run into to you but when you kill them. they drop rotten flesh i know gross but it can be a sources of food. and if your lucky it will drop prizes.