I also like AOC a lot. I'd be super happy to see her as Madam Speaker, if enough House Dems can get behind her.
I think she has her own kind of charisma, but she seems to self-censor sometimes because earlier in her career she was targeted with a lot of republican hate. She was one of the first progressives to break ground in Congress. She's a strong, independent Latina woman. In short, she's everything republicans fear.
So there was a lot of red scare BS thrown at her, not to mention the tons of misogyny that tends to follow any woman who's successful in politics. She's also had to make waves even in her own party just to be heard. Some centrist Dems viewed her as disruptive. So she doesn't seem as outspoken on the House floor as she once was, which I view as a strategic conservation of energy. She still does a lot of great work on her committees, and that's probably where you've seen her shine on CSPAN (a great resource, more people should watch it).
She also does a lot of legwork behind the scenes reviewing policy, organizing the progressive momentum, listening to her constituents, and actually fighting for their needs. She still has a lot of energy, but she directs it where it's appreciated now. Progressive rallies, reaching out to the younger generation of voters on social media, educating anyone who will listen, etc.
In short I think she's a really great politician, and a great person in general. We might need a few more electoral cycles before we have enough progressive Dems in the House to support her for Speakership though. And by then I hope she primaries Schumer anyway.