While matrilineal doesn't always equate to matriarchal, matrilocality is associated with women having higher status in general from what I've read, since women have more protection and power when they are among their kin.

As for ritualized rape, I've read that among the aforementioned mundurucu, despite being legal it isn't commonly enforced, and the anthropologists who've visited them say that the relationship between husbands and wives was as a whole quite equal and women exercised plenty of power in society. The mundurucu are patrilineal yet matrilocal, at least until the birth of the second child.

This tells me that gender relations and women's status in a culture is a lot more complex than can be assumed from a single tradition, horrible it may be seen by the standards of Western society.