Assassin rework summary
Rengar Khazix Broken as fuck.
Katarina Talon Fun mechanic, still weak.
Leblanc More counterplay IF YOU ARE MOBILE or ranged, else she is basically the same if not more disgusting.
Ekko Tank build dead, AP still bad.
Shaco For whatever reason is forced to build ap, can't gank early anymore.
Akali lets wait for her full VGU, the change is meaningless.
Fizz Still annoying, hitbox super stupid, mana buff means more brain dead.
Zed Exact the same.
Most Benefited Supports Twitch and Vayne Bad adc players Other stealth users Burst/control mages
and 
and
Less frequently
support would use it.

And even some tanks like
or
in certain occasion.