Who actually took successful and lasting revenge on JR?
There were a few people towards the end of the show, but does it really count? All of this was plot-driven so that by the series finale, JR would be so distraught that he would consider suicide.
Sue Ellen had her revenge with the film about JR, but I was never really convinced of it. In the oil business, everyone already knew what JR was like, and was it really that important to him what the middle-class moviegoer and any film critics thought of him?