"The Greatest Joker Stories Ever Told" was okay. It's divided into roughly three sections, the first are the earlier Joker comics, mostly from "Detective Comics", then the middle half of it are ones where the Joker was appearing frequently in "Batman" comics, followed by the last quarter from later on, the 70's.
In the first quarter, the earlier stories, the Joker is a killer, like we expect, with all his victims dying from his Joker venom or gas. Those stories are okay.
The middle half, the longest section, is the most kid-friendly, where the Joker never kills or even threatens to kill. Most of the stories revolve around the Joker announcing he's going to steal something and then trying to do it. Many times they're based on some pun from his message. Batman in those is a hero, hanging out at City Hall and teaching criminology classes, in costume, at Gotham University.
Finally the last few stories are much darker. The Joker is again a killer, and Batman is much darker, much more troubled, with the ears on his cowl longer and his cape billowing out behind him like he's almost a gigantic bat.
It's the last ones that are best stories, of course, but also the most confusingly drawn, with lots of things in frames I simply couldn't identify. In one, for instance, I couldn't tell what the Joker pushed his associate in front of, I had to go back to the page before to recognize it as a moving truck.
Overall it's entertaining, though the middle half was kind of dull, wearing thin after a few stories that were mostly the same, with little variation in plot. The beginning and the end are fantastic.