Lucas was an EP and writer for all three Indiana Jones films. I think these films hold up better than Star Wars, so I wouldn't say he has any passion or talent since Star Wars. With respect to the three Star Wars films though (and all the garbage that came later), I agree.
They do hold up better, but it's because of Spielberg who did the directing (I can't even imagine the cringe mess Lucas would have made - I'd rather we had a Tom Shelleck Indiana Jones movie, as was considered at one time, than a Lucas-directed one), Phillip Kaufman (who fleshed the story plot) and Lawrence Kasdan (who wrote the screenplay) rather than Lucas.
Lucas contributions were iconic, but not enough to get the movie to the level it is. From some dialogues I've seen between the whole team about the films [1], Lucas was more into throwing high level ideas, not about any core script work. So, the main concept, parts of the character design, and a high level plot summary. The rest had to make a full story, screenplay, and movie out of it.
