PBE jungle. Why is it ridiculous?

As a jungle and top main, I certainly do not understand why you would make all mobs in jungle hit stupidly hard and increase their health to ridiculous level. I love rengar, leesin, and elise since these three are deadly junglers who can assassinate at 90% rate if the target gets caught. But the early start of the jungle is just too much pain. I do not find any trouble with leesin and elise but for rengar it is tough, no too tough. No one would start red or blue these days in PBE yes? mostly junglers start with golems and frog (forgot its name) since they render easy level up to 2 and therefore any junglers hardly use smite on red or blue as their start. One time there was the game where I took the ap runes by mistake and my rengar could not kill the first blue or red without the smite (the smite was spent on golems and frog). Even with the proper runes, rengar consumes all 2 health potions to kill the first blue or red because he nearly dies. This is absolutely ridiculous. When melee junglers suffer from these problems, I was shocked to see that ranged champions jungle easily. I often see kayle, fiddlestick, and even twistedfate as junglers and I saw them jungling without taking red potions because the stupid AI mobs come and go then spin around in circle without hitting them. what the fuck is this? am I seeing rome 2 reference here? where units do not fight or collide on each other but choose to spin around?

I understand that this was an attempt to prevent from farming jungle with faster pace than solo top and mid lanes. But was it necessary to increase jungle mob's health and dps? I can understand the slow mob regen rate but other portions are hardly acceptable.