In any case, the reason for not marrying a girl whose father is not a Talmid Chacham or whose brothers don’t measure up (in Middos), is because of the assumed effect on the girl.
If it in fact has that effect on her, then presumably she won’t be interested in the type of boy who doesn’t want a girl with that effect. And if she is an exception and it doesn’t have that effect on her, then presumably it would be okay for the type of boy who (normally) cares about these things to marry her.
Bottom line – people who are on a certain level generally prefer to marry people who are similar to them.
Although, there are exceptions – I don’t have good middos, but I want to marry someone with good middos. But my brother has good middos, so I guess it’s okay.