To me, Superfriends is where King really hit his stride after some fairly lackluster issues in Rules of Engagement. Not that the Annual was lackluster, but I'm sort of not counting it because it stands so apart. And it was great.
Rules of Engagement seemed to be intended to be humourous, and thats where I think it failed to deliver. The whole thing was tonally odd, as we have Dick and Damian banter, Talia and Selina banter and even Bruce and Talia banter. It just doesn't feel right. There were some good lines but overall the story feels off.
The humor in Superfriends was just about pitch perfect, though. One of the highlights of the run for me.