User blog comment:Morgan silve/Tia Harribel vs Nelliel/@comment-1393830-20100913052526/@comment-893506-20100913064546

This is true, but I think people think of her as weak due to how easily Ulquiorra dominated a Bankai + Hollow masked Ichigo before transforming into Segunda Etapa, whereas Harribel had to do some form of work to try to take out Hitsugaya after she released (which, you have to admit, is weird, since, even in Bankai, he struggled against her base form).

Despite that, Hitsugaya's attack didn't kill Harribel (which is what he was going for), and we have no idea what would have happened to her if Wonderweiss hadn't arrived. Anyway, before I start a different discussion within a discussion here, I'll get back on topic. As Godisme pointed out, even though she struggled against Hitsugaya, Lisa, and Hiyori, she still came out of the fight unscathed (until Aizen said "Screw it, I'll do it myself" and killed her).

Aside from that both Nel and Nnoitra are confirmed Adjuchas, and Harribel's a Vasto Lorde. I like Nel, but in a one-on-one fight against Harribel... the odds do seem to stack up against her.

This is just how I feel based on what was shown in the manga.