ROTJ is a lot darker between the lines than most fans realize. Jabba isn't that far removed from an evil fat sultan leering at his female captive between hits off the hookah, but it becomes more disturbing when the sultan is a fat alien slug.
I think it's good that Leia takes Jabba down herself. That's one of the big audience reaction moments I remember all these years later.
A lot of Rule 34 has been inspired by the Jabba scenes. Not that I know about such things...