Originally Posted by AlphariusRising
2. With Oracle's he has no ult.
5. The base damage on his Q is pretty low, if he doesn't build lots of AD it's only worth it for the attack speed buff.
I'm ignoring the rest since they're good points, just remember when Akali was considered OP the argument "Buy an oracles or ward already" was countered with "BUT THEIR EXPENSIV ND I NEED DA GOlD FOR GOOD STUFF!!! I 500000000 ELO AND YOU NUB!!!".
While their arguments are somewhat silly, and oracles is
expensive if you don't know how to acquire gold. And since supports are obviously the only people in the game with the ability to buy wards/oracles, if they don't buy one then no-one will. Akali got nerfed because of it, so that could be considered a point against Rengar.
As for point 5, if he does buy AD then it's like a Talon or Nasus Q, doing a considerable amount of damage and making everyone cry.
Wards/Oracles/Armour/CC will counter him, but that's waaay too hard for most people so RENGAR TOTES OP AHHHHHH 'facechecks brush by Flashing into it while on 20hp'