I'm wondering what you think they got right, at least according to what the Bible says
This would require that the Bible makes clear statements, so that one could compare those to JW views.
But with the Bible you can prove that Trinity is right and you can prove that Trinity is wrong.
You can prove that war is right and that war is wrong.
You can prove that Christmas is right and that Christmas is wrong.
Accordingly, depending on which verses you consider, JW's are right or wrong.