Not repudiate, no. Not if heritage is defined as doctrines and practices to which one is committed confessionally. Admittedly, there’s a lot of wiggle room there.
In other words, I think that “Roman” Catholicism has been scarred by schism, and needs healing. Certain doctrines and practices need to be renewed and placed in better relationship with the original sources. (See Raniero Cantalamessa’s Lenten sermons on justification by faith for one example of how to do this.) But with Protestantism there comes a point where that’s not enough, because the sources have been truncated in the first place.
If you are committed to reading Augustine through the lens of Luther, then there comes a point at which you will not hear Augustine (or indeed Paul) properly. If you aren’t committed to doing so (and you shouldn’t be–no one should be committed to something that narrow), then you have to be willing to say “Luther was wrong” if necessary. Wrong, I mean, in basic doctrinal claims, not just in the many crazy off-the-cuff things he said, which no one would defend.
A case can be made that the same is true for reading Paul through Augustine. I have struggled with this issue in trying to decide between Catholicism and Orthodoxy. But it’s not as clear to me either that the distortion is as great or that the Catholic Church is committed to Augustine’s version of Paul in the same way that confessional Protestants are committed to Luther’s version of Augustinianism. The fact that Rome has no problem accepting the Eastern version of Paul as orthodox points to this. Confessional Protestants simply can’t do this. (See the debate in the ACNA over the Filioque–the Reformed wing of the ACNA, who do in fact see the Articles as confessional, not being wise enough to listen to GKC on this one, resisted dropping the Filioque in part because they thought the Orthodox were wrong on soteriology.)
Edwin