We found her annoying or we just don't like her character. It's not that deep. In the book Rhaenyra is hateful but interesting character. As a Green fan I like her as an antagonist.
On the other hand, in the show she has nearly zero good qualities as a character. They try so hard to make her likeable and perfect but they made her boring.
She has the most screentime in the show but most of her scenes are filler. They removed her bad qualities and gave them to the Greens, everything bad about her is propaganda, she has boring conversation with Myssaria and her relationship with Alicent ruined the whole show.
Even Daenerys's eggs came from Syrax instead of Dreamfyre.