User blog comment:Berryeater/Let's Talk about Rengar - The Pridestalker/@comment-27802145-20160614041017/@comment-28465461-20160614053401

AD over crit/penetration is for obvious reasons, his E to do more damage and his Q does bonus on-hit damage. As for any AD champion AD is always a must to get first to amp up damage before you bother with other stats, especially for empowered basic attacks and ratios above 80% and up. Most of his damage comes from his basic attacks. As you said that his ratios are gutted, but basic attacks are total AD where Q is the boosts his on-hit effects by using Q, the maths would be T+(T x 0.2), or T+(T x 0.3).

Penetration is basically depending on the type of penetration, flat is not useful lategame. Back then rengar can still one shot carries without armor penetration, % penetration proves to be better for rengar.

Fevor of battle is superior to thunderlords in everyway because of it applying massive DPS without a cool down. 5% attack speed, is much better than 3% movement speed out of combat because you are very mobile anyways and as you go in combat, you lose the passive in combat. Bounty hunter is obviously better than Dangerous Game, 5% more damage increase makes him snowball hard or scale into a monster late game. And lastly, 7% armor penetration is definitely superior to 5.4 flat hybrid penetration. As I have stated in my blog is that the only thing that you would run cunning for is the assassin, merciless, stormraider's/thunderlords and maybe hybrid penetration, the rest are pretty much inferior to the other two.

He can split push and destroys very effectively well, I have done this many times as rengar. It does make up for his lack of team fighting power and he does only have a reliable engage when he does go in a team fight. For disengage you have to predict where the enemies are going, especially if a lot are MIA, chances are they come after you when you split push. You need time to use your ultimate and make a decision depending on the situation (as if your team is there or not). Bonus AD and attack speed steriod from savagry does help him secure objectives rather easily on your own.

He does have a versatile build path due to the fact that it is in the nature of his kit, From fighter to assassin builds he can perform rather very well. Its all about judgement on what you need to win the game and make it easier for your team to win games. Outside of AP, everything else is pretty much good on him.

I have come back from games when I was behind as rengar, especially one game where it was an enemy zed and lee sin, counter jungling me and got me very far behind, all of a sudden I find empty lanes to push, farm lee's jungle, then spring right back up and delete zed and made lee run with low health. From getting all the gold from minions, towers' and lee sin's jungle, I was strength of the ages I was running that game too.

I have had many rengar games, I play on the CN servers currently.