In season 4 I could jungle Evelynn, Master Yi, Warwick, and Udyr. Sometimes if I was feeling like a change, I'd jungle Rammus. Those 4 were my mains, and Rammus was my "screw dat enemy team comp, I wanna play a full tank against that" guy.
Evelynn is trash in the new jungle, especially after the nerfs to purple smite (even BEFORE that she was trash). I don't want to play her and try and make it work.
Warwick got gutted and is weaker than he was in season 4. I don't want to play him and get zero early kills because I do no damage.
Udyr can't AFK farm as well (because the camps have ridiculous respawn timers) and can't acquire as much gold as he could in season 4. His ganks are trash (especially with less gold). The only thing he does well is take dragon. And if the enemy team groups for dragon and your team doesn't.... Then he can't even do that. I don't want to play Udyr.
Rammus is absolute garbage in the new jungle, and can only survive the camps if he maxes W first. Maxing W instead of E means your ganks will be trash, and you might as well not even gank until after level 6. If you DO max E first, and try for early ganks (ie: play Rammus how he's supposed to be played), and your gank fails, congratulations! The next jungle camp will execute you because you're now super behind. I really don't want to play Rammus and make him work.
So that leaves me with.... Master Yi as my only option.
"Diversity"