Had the opportunity to play as him, against him and wit him all day, here are my thoughts,
Lets start with his passive. It's strong, its really really strong. I swear its like having a built-in warmongs that's always active. even though he's supposed to be squish like an assassin you won't really be killing him in lane ever because of his passive. The grey health meter is way-way to forgiving and it almost makes him feel tanky, I'm curious to see if this passive would work well on a tank Pyke. you either have to commit and all in him right then and there or risk him backing off into a bush and returning to lane a few seconds later with pretty much full HP.
His pull (Q) is weak. It's slow to charge, slow to launch and the pull distance is pretty crap. It's a very situational skill. Compared to
and even
its very weak. Alot of the time landing a hook in a team fight doesn't do much because your team cant capitalize on the distance. If you want to throw them further behind you then you have to be willing to sacrifice yourself.
His Stealth (W) is very strong but only because of how much MS it gives. If they toned down the MS it grans on use i feel this move would be much more balanced. His W an also proc his passive so if a duel is going bad you can flash away and W around your opponent to regen all that HP you lost in the duel and sneak attack hi from behind. but the MS it grants is generous that most Pykes are using it as a travel tool rather then its intended purpose
His dash (E) is alright, its probably the only non-ultimate skill he has thats in a good place. they dash distance sucks but the added stun more then makes up for it.
His execute (R) is not as strong as people are making it out to be, the hitbox for it is whack and its surprisingly easy to bait out and dodge. On top of that it forces Pyke to commit to a fight so if he ults someone who;s retreating into their entire team the ult places Pyke right into the middle of the 1v5 where he can be easily focused.
In all honesty, he's not in a terrible spot.
Passive and W are in need of toning down, Q could use a bit of love, but thats about it.