Pyke deserves nerfs, let me explain why! (numbers included)
Lets start with external aspects. As per op.gg, he currently has highest ban rate of all champs (62.48%). Maybe because he is one of the hardest snowballing champion in game. Pick rate is 7th highest at 18.12%. Win rate is at 51.15 %, and if you look at pickrate/winrate ratio this is quite high second only to Tresh, what I mean is pick rate going up is sign of champion being picked regulary by non pyke mains, specially since 9.14 R gold buffs. Ezreal and other champs (Kaisa, Lee, etc ) have higher pick rates than Pyke but not as much win rate.
Now lets have look at his kit,
Passive - This ensure you can't poke him out. This is actually helpful in any lane you chose to go. Poke is a way to counter melee assassins. Zed, Fizz, Kata, Akali, Talon etc, but none of them have as much sustain as Pyke. Yes, Talon has hp gain if you kill minions with Q and akali also has sustain but that requires them to enter combat, unlike Pyke who can regen just by going out of sight.
Q - This is lowest cool down hook of any other hook in game, max 12 sec at rank 1. Unlike other hooks, this hook has melee interaction. Other hooks are easy to miss in absolute melee range, but this isn't problem for Pyke as he can just Q stab them.
W - has good synergy with passive. Gives good mobility early, and later on with couple of points in W and lethality with mobis no one can out run him or catch him. Camo helps to roam without detection, plus W speed allows Pyke to get close to some one fast and proc duskblade passive plus melee Q stab for nice slow. Easy kills while roaming. If his E still damage monsters, he would be top tier jungler.
E - easy escapes. AOE stun. Good Pykes will always have either E or W up. Catch them off position ? nope. think again! Escaping ? lol he just stunned you! and his Q is back up again :(
R - Double gold for killing with it or getting assist with it. ??? This should be reverted. No one asked for this. Not even Pyke mains. Free additional recasts for successful executions, at no cost whatsoever and the recast time limit is 20 secs which RESETS on each successful usage gives nice big cheques of gold, which overcompliments his lethality kit in terms of cost.
In conclusion, he is very slippery with lots of CC and insane snowball potential. I suggest that we should get an indicator that tells us whether below threshold or not.