It's ironic as you say he doesn't have a cleanse but right now I see that his EMP W removes crowd control effects.You forgot to mention old rengar had 5 stacks and not 4.The ult part makes absolutely no sense regarding the subject.You're trying to prove his ult isn't overpowered by saying he ults from close range anyways (which is not true), so let me restructure the argument.A rengar player will not ult from close range as it gives him a movement speed bonus, which he can use to gank an adc that is not near his support.Another strong effect of his ult is the true sight part of it (seeing an invisible teemo, talon or shaco which makes him a strong counterjungler midgame).HOWEVER, I'm going to do something that you clearly haven't done and that is to prove why Rengar is not overpowered.True vision (control wards, tf's ult etc.) makes him weak.Is it not true that the strong aspect of the champion is the fact that he can jump on you out of nowhere and once you have vision on him, he becomes far weaker? Also, early counterjungling messes him up a lot, especially by champions that have strong clears and good tools for invading.Also, unless there is a rengar-ivern combo, rengar can only do his complete combo while in brushes.Ganking mid is especially hard because the distance between the brushes and the minion wave is too far for him to jump.His second most reliable ganking tool before 6 is his E, which is a skillshot.Not to mention, rengar is a high risk high reward champion (just like Riven, Yasuo).That means once he's behind, it's really hard to come back from it (unless he fishes for some low life targets, solo players or adc's that have really bad positioning).Not to mention, tanks, chain cc's and teamfights make his life harder (just like with any other assassin).In lower elos it's easier to kill an adc in a teamfight and sometimes get away with it.But in higher elos you can see that Rengar has a hard time to go past all the shields, the disengage and the peel from the enemy team, not to mention getting one shot by the adc itself.Rengar is a hard champion especially in high elo because you need to know WHEN to engage and HOW to setup your engage, using the terrain.
Nice try but next time try being less arrogant and ignorant.