Well, it's quality animation, just not super animation. As predicted the voice casting was great for a sub par story about taking down the Justice League using stolen contingency plans of Batman. The plot is adapted from some different comic arcs. One from a JLA story from the 90's with Ras Al Ghoul as the main bad guy instead of the movies Vandal Savage. The other inspiration is from two seperate Superman/Batman comic arcs. There's also one scene with Batman stolen from Kill Bill 2. The movies a fun rental, but won't ever make any top list, because of a lackluster plot and average fights.
It has it's moments like a great we are the universe seen towards the end, but everything could have just been better. Why not make a Legion of Doom with Lex Luthor and Joker? Why not have more than one major fight? Why are all the colors so subdued? Why not have a unpredictable plot like say Arkham City?
Character design of Mirro Master? What the Hell?
No scene will make you say "Whhhaaatttt?!!", out loud. It's really just made me miss Justice League Unlimited. Grab it for $15
Justice League: Doom (Blu-ray/DVD Combo + UltraViolet Digital Copy)