shes is the only Assassin in game that riot knew what they were doing when they made her.
all these other "assassin" champs are so lame and weak and are mostly mele based, khazix is a recent example.
rengar was also an other good assassin champion, but was nerfed,(i still think hes not bad and can win games in solo que)
so ya, the only reason kat is working, is because she is a true assassin, as suppose to all the other champions riot just likes to trow into the assassin section.
and personally, i say instead of nerfing her, add her passive to other assassin type champions, reduce the cd on their abilities for kill/assissts.
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