I don't Feel like an Assassin When I Play Kha'Zix

More like a janitor there to clean up my team's messes. If someone is low enough to be killed by Kha, the fight was already won, which means that if your team loses the fight, he's effectively useless. Jumping on someone is a risk since your biggest tool for escape was just used to engage, and if something walks over to them, champion or minion, your damage becomes negligible, which will likely result in death. Participating in a teamfight is suicide since aoe collateral is enough to bring Kha low, and with everyone grouped together chances to capitalize on Isolation are slim to nonexistent.

I've seen Talon hop right into the middle of a teamfight and delete a carry, Rengar doing the same with his ult, Zed jumping in and out, LeBlanc blowing someone up with an E R, and don't get me started on Fizz. All of these champions can be just as effective in a teamfight, doing their job as assassins, as they are outside of one. With Kha, I don't even feel assured when I see targets are Isolated since the bonus can vanish if there is something friendly nearby. His ultimate feels more useful as an escape tool than an engagement one, and even then it is incredibly lackluster. The only purpose it serves during an actual assassination is a way to possibly stay safe and stick to a target while waiting for Q to come off cooldown.

I am not a pro player, by any stretch of the imagination, but I at least consider myself competent; this is simply how I feel.