Even if I learn a great deal R. Rav Nahman,I do not give approval to everything he says.
In terms of Torah I think that the Gra was right. The problem the Gra was addressing in the letter of herem [excommunication] was that of idolatry (or worship that is not of God alone.) This is totally ignored nowadays to the degree that the religious world actually believes [as strange as it may see,) that they keep Torah!?? No. Not at all. They keep rituals in order to seem as if they keep Torah. But the religious world is the opposite of Torah since their religion is based on idolatry.] [If the Torah is not about not to worship anything but God, then it is not about anything at all. The rituals do not count.]
See Proverbs 3 verse 5 and 6 in the commentary of the Gra. Trust in God. Forget about your own efforts. And not not trust in anyone except the First Cause.]