Why is Rengar punished for playing 3v3?
It doesn't make sense really, Rengar
can only reach a potential 3 trophies and will therefore lose 13% bonus AD and 13 AD, which is one heck of a power decrease. I have learned that there are other champions out there that get decreased effectiveness on 3v3, but for Rengar's case it's absolutely extreme. Let's take a look at Renekton instead, who loses a bit of health on his ultimate with every rank. 250 health is lost on Renekton's rank 3 ult.
Rengar AD bonus loss 15.3 AD from Runes 10 AD from Mastery 13 AD from Passive 265 AD from Items according to highest winrate build http://champion.gg/champion/Rengar/Jungle
= 303.3 Bonus AD
x 0.13
= 39.429 AD
http://leagueoflegends.wikia.com/wiki/Gold_efficiency
1 AD = 35g
~40 x 35g = 1400g at level 18 full item build lost
Is probably the highest Gold loss of all these.
Comparison to Renekton: 250HP x 2.6 = 650g
This is a rather heavy nerf just for playing on a different map