Justice League: Doom is the third animated film in the Justice League film series. It is based loosely on Tower of Babel storyline.
http://dcmovies.wikia.com/wiki/Justice_League:_Doom
Justice League: Doom is an animated superhero film loosely based on
Mark Waid's JLA story arc, "
JLA: Tower of Babel". The movie was adapted and written by
Dwayne McDuffie right before his death in February 2011, and is directed by
Lauren Montgomery. While not a direct sequel to
Crisis on Two Earths, the film uses the same character designs by the Lead Character Designer, Phil Bourassa. It will be released on February 28, 2012.
[1] The film also features various actors reprising their roles from
Batman: The Animated Series,
Superman: The Animated Series,
Justice League,
Justice League Unlimited and
Green Lantern: Emerald Knights respectively.
[2][3] It is the 13th film in the
DC Universe Animated Original Movies line.
The
Blu-Ray combo pack includes Featurettes only for Blu-Ray called “Guarding the Balance: Batman and the JLA”, a mini-Featurette called “Their Time Has Come: Cyborg and the DC Universe’s New Diversity”, while both Blu-Ray the 2-Disc DVD edition has "A Legion of One: The Dwayne McDuffie Story", a Sneak Peak at
Superman vs. The Elite, and two bonus episodes of
Justice League.

Ah! Once again, they were taking pieces from a long story and forcing it into a 2 hour film. Like I said in my quick tip, I am no expert in the comic book university and am probably not suitable for evaluating these adaptations (so please take my opinion with a huge grain of salt). Still it did provide some entertainment though and indeed the voicework was also good.
I just recently saw this film last night and I have to say that I agree with you on this one. While it was slick, fast paced and ever so entertaining, it lacked two fundamental basics that are required to make a story. Namely plot and character development and although, I do not have your knowledge on the original source material, from an outsiders opinion this film left me wanting so much more.