Fighting mobs in minecraft is easy. Like the zombies, skeletons and spiders. For some players, fighting zombies with skeletons is hard but you only need a shield to easily fight them. I want Mojang to change this. Add some timing? add strike patterns? It's up to Mojang to decide.
Zombies are very easy to fight. Mojang should spice up fighting with them. Like add some different zombie attacks, each zombie attacks have timing to block or dodge, and also attacking the zombie should have timing or something like that. That's the same with other mobs.
Zombies can call more zombies that have spawned nearby for reinforcements. On top of that, they have a chance to litterally spawn more zombies nearby out of thin air, provided wherever you're attacking them has plenty of unlit places for new ones to spawn.