Is Katarina broken?

I would like some feedback based on Katarina. A lot of people say she's broken as hell. But when I get CC'd for an hour after trying to assassinate, I'm wondering if it's just a low elo perspective. So, Diamond overlords. Is Katarina overpowdered/broken? I only ever have people complain about her if they're like, below gold. Where people don't know that CC is the bane of Assassins in general.
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