Quote from Mobax... the plan was to make the survival Minecraft more challenging and Mojang has done this... I would like to know what you think players can no longer do that they used to be able to do.
It is not any more challenging. It is a now a nuisance as what used to be, on Normal difficulty, exploring cave systems and fighting mobs is now as previously stated simply hiding in a corner and fighting zombie after zombie. In 6 minutes of exploring an abandoned mineshaft I'd clocked nearly 50 zombies killed and I'd progressed about 3 blocks. Many of these zombies had full enchanted armour. Zombies spawn in fully lit areas. Zombies find their way up your caves into your house.
It doesn't make it more challenging, it doesn't make it more fun. It makes it an annoying experience.