The Jg exp changes just feel so bad to play with.
Scenario 1:
Top lane is vs Darius and dies twice to him, Darius is level 6 while you are 4. There is no way in your mind you're going to go top and help your top laner out, you pretty much have to let him fend for himself or give chance at Darius 2v1ing with his level advantage.
It just feels so snowbally. If you end up getting fed as the jungler you just go in the enemies jungle and take all their camps while your teammates are doing the same taking the enemy camps as well, making it a 4v5 since the enemy jungler can't come back in levels.
If you're behind as a jungler you just want to /ff since everyone and their mother are taking your camps and before you know it you're down a bunch of levels. You can't do anything while you're behind to come back in levels.