The Kingdom was horrid. But, as already stated by Dave and Chewy, the only really good single-issues that came from this limited series was Offspring (Frank Quitely's art at it's unrushed peak) and Son of the Bat. Offspring had a great story that examined what it would be like to be Plastic Man's son. The son of a joke, really. And, the Son of the Bat (Ibn' something something) was excellent, as it showed what someone born of Bruce Wayne and Talia Al'Ghul would become....better than either his dad (Bats) or his granddad (Ras Al Ghul). I recommend trying these single issues out.
Other than that, The Kingdom didn't happen. It was a boring, rushed piece of sensationlism. The big "revelation" of Hypertime and the "true" identity of the Phantom Stranger (the son of Superman and Wonder Woman? Come on!) was pathetic and unconvincing...
