Legit, is Senna broken, or...?

I'm legitimately asking, because I've found a support I not only enjoy playing as much as I do any other role, but I'm actually good with her. I'm the guy who was actually happily maining Vlad pre-rework, and saw no issues with his E. I feel almost as good as I did playing him during that time as I do now with Senna. Maybe it's her damage? or is she just about as fine as Pyke? Just curious, because I hope i'm not enjoying her solely because she's broken, and I'm oblivious. Edit: I just really feel like when it comes to damage, I actually have an impact in team-fights compared to just hiding, and popping heals, or engaging to tank damage. I want to destroy things, and she makes it happen.
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