What do you think about each assassin?

Like which of them are healthy for the game, doing their job as assassins, but not being too oppressive?

Which are underpowered or straight unplayable?

And which have downright trash design and frustrate the hell out of everyone with their gimmicks?

I don't care so much about about winrates, but rather about personal opinion.

On instance, Talon is fine for me. His burst is very good, but he can't do too much after getting a kill and has to E away.

Same with Eve, her charm is impossible to dodge because of the point and click E, but without ULT and before Lich Bane, there isn't much she can do. So she can reliably kill one champion, but then she has to run away.

Akali can so easily just kill multiple people and so does Katarina, while Zed can output 5000 damage on full combo+Electrocute+ULT pop at 6 items.

LeBlanc distortion is annoying and I don't care about nerfs, that ability shouldn't exist, it's Zed W on steroids. She also has the Karma W as her E(though skillshot). This champion is not ok.

Shaco isn't too strong, but he is very frustrating to face. So slippery. He might be underpowered though.

Kha is legit broken due to invis proccing Duskblade and his passive, giving him windows to assassinate 2-3 people easily when fed or close to full build.

Not gonna list all, but in general these are examples of what should and shouldn't exist in my view.