Rengar needs to be fixed.
As a Rengar main, I'm especially unhappy with his his rework. Mainly the ult change. (And feel as though it's the reason Rengar is now better off as a bruiser/tank)
New ult makes hunting impossible in mid/late game, which is turning him into a bruiser/tank.
In terms of an assassin play style, the warning range is absurd and enemies see you coming from a mile away and just run off to their hidden team mates. I feel like ulting and hunting down a target as an assassin in the mid/late game, is basically baiting yourself most of the time. The reason he's banned so often is because his early game is ridiculous. He snowballs too fast with his passive, and he quickly becomes a bruiser/tank with a ton of damage.
His W is also best suited for a tankier play style. I say gut it (remove the cleanse), and nerf the passive so his early game isn't so absurd. To compensate, return the ult warning back to the way it once was, so we can hunt again, and actually play Rengar like an assassin in the mid/late game. Either that, or revert Rengar to the way he was pre rework (without the clunky E that flies over enemies heads).