Well the only one who dissed her is the mole-chick. No one else even knows about it, supposedly. And she dissed it because it's the ugliest technique she had accumulated so far (if she even bothered to learn it after seeing it), when she has all the other ones that can do the job and also not look ugly.
In the end, the reason comes down to thinking it doesn't look very "warrior-like". Even Cassandra thinks so.
I remember who Ophelia was, but I don't remember who Hilda was.