Do you mean Leafa or Sugu? Sugu rocks. Leafa, not so much.

Regarding the "learning" thing, there isn't actually much to learn. It's like saying:

"I picked a partner for my daughter and he turned out to be an asshole. If I choose another wealthy person for her then he must also be bad. That means either:

1) All wealthy persons are assholes, or
2) All people I choose are assholes."

It's much more reasonable for her to think that it was a one-off chance that resulted in a bad person. The one incident where the fiance was bad doesn't actually support the logic that she should change her ways. That's generalising too much. The reason she shouldn't choose for Asuna lies elsewhere.

I don't like Zekken too much. She sounds too much like a trap. Whenever I hear her talk I hear a little brother.