Why I like BoBF is because it made him more than a cipher. He became a person with a difficult history, a damaged sense of purpose and finding new purpose. The show may not be for everyone but I love it, and actually like Fett now. I used to hate him.
Although I didn't love "BoBF", I did like it (aside from those two "Mandalorian" episodes). But what I really liked about the series was Boba's development from a mere bounty hunter to (and I can't believe I'm saying this) a major criminal who surprisingly proved to be a decent civic leader and plenty of character development. I never understood the appeal of Boba Fett in the past. I had only found him slightly interesting as a kid in "The Clone Wars". But I liked him in Season Two of "The Mandalorian" and I really liked him in "The Book of Baba Fett".