In general, I think that Ms. Marvel is an important character.
I did not think much about there when I landed here less than 2 years ago, as I was into golden age, but as I picked up silver age once again I realized that, besides the good stories Claremont wrote in the title, Carol Danvers continued to appear in X-Men, becoming Binary. Her tenure as an Avenger in the 1970s and 1980s also contributed to her popularity, and right now she has taken the mantle of "Captain Marvel", although I don’t appreciate what Marvel is doing, so she’s probably as much popular as Spider-Woman, maybe more, for similar reasons.
Now for some break – find me the issues I miss above issue #20, whetteon, or we’ll run once again in a loophole discussion of late copper vs. early bronze!