I believe the Witnesses have become like ancient Israel was. They have the primary truths about God and His promises...BUT like the Scribes and Pharisees, the GB distorted and perverted the true Christian worship of God and reduced it to a religion of OT rules and those teachings the apostle Paul that are erroneous.
I do believe the scriptures in Matthew and Luke concerning the Faithful Slave turning Evil have come true. I'm looking forward to when the Master arrives.
As for what I believe the Witnesses have correct and what sets them apart from the rest are theses teachings...which I still hold to.