Spoiler Level: High
Okay, first things first: The DVD cover is the same as the graphic novel cover. Major, major points for that.
Second things second: I've never read the source material. Superman/Batman (the comic book) came out at a time where Jeph Loeb was driving me crazy with how he was handling the Superman titles. Yes, I was one of those few people who actually enjoyed the "Superman Weekly" format and the HUGE cast of Metropolis that grew out of it. When Jeph Loeb and his crew came on board, their goal was to get back to the basic cast and split the four Superman books back into four separate comics. All of which I wasn't thrilled about, but was handling okay. But he was also very big on returning the characters back to the way they were in the Silver Age, and that led me to eventually drop all of my Superman comics. So I never read Superman/Batman (or "S-Bat," as Rich and I always called it) when it debuted.
In hindsight, I'm glad I didn't, because it allowed me to go into this movie with a fresh attitude. And it's really good. Oh sure, the Giant SuperBat Robot made my jaw drop, and not in a good way. But I can forgive that, because it tried to be an homage to the Super Robots of old, such as Mazinger Z, and because the rest of the story worked so well. I always liked the concept of Lex Luthor being president, and the guest stars alone gave a lot of great moments; Power Girl having such a big role was great, seeing so many villains try to take the two down was fun, and best of all... a true Superman vs. Captain Marvel battle!
Chalk up another win for the DCU Animated Original Movies!