Zombies are extremly easy,but you almost can't defeat them without losing at least one half of a heart.
Spiders i hate,they are the bane of my existance.
Skeletons i can dispatch in 5 seconds.
Creepers i can take out but i won't dare to try if there's more than one/they're at my house's door
Ghasts are the same as spiders.
Pigmen i'll only hate if they are in a massive group. I mean massive.