Finally got around to this and went in without reading the book first. It's probably the most satisfying Superman story I've ever read. The cliche "If you've ever seen one..." is thrown around too much, but it really does apply. If you only watch one Superman story in your life, let it be this one. It covers the mythos nicely, it keeps everyone in character, it's genuinely enjoyable, and it has a great ending that ties everyone's story up nicely.
An adaptation of All-Star Batman & Robin WOULD be hilarious...assuming Frank Miller ever gets around to finishing it first.