This is why Rengar needs a serious nerf
I played a Nasus and all game long, literally all game long, rengar would jump on me, and 3 hits i'm dead couldn't move, just dead. Even with 300 armor+, he had no armor pen from what I can tell and, still, 3 hits dead. Here's some screenshots to show you how broken this champion really is.
First his gear http://imgur.com/a/j7OMx
Next total damage (54172!!) http://imgur.com/a/Si0oc
Next his physical damage (291630, yes that's over 290 THOUSAND) http://imgur.com/a/0cBQv
The game length was only 38 minutes long...