Animation
Like all the other DC offerings in this medium, the animation is solid and art style is consistent, but Doom feels rather dated and tame.
Similar to the other DC animated movies, Justice League: Doom's art style seems to be a good mix between Japanese anime and Western comic book style. All the characters look really good, especially Batman and Wonder Woman. This particular style of anime has a very feminine feel to it, so the girls look great but there were frames where some of the male characters looked like they were having a coming out party.
I'm fabulous in spandex.
These direct-to-DVD movies from WB and DC normally have awesome fighting scenes and big action sequences with enough diversity and innovation to make sure the experience is unique. Surprisingly, Doom doesn't seem to have much of either. It didn't have the heavy hitting Shazam & Superman: Return of Black Adam did, or the slick fighting choreography of DC Showcase: Green Arrow. That's not to say that it wasn't without its own cool moments. It had a few of those, but at best, it felt like an average episode of Justice League: Unlimited.
Thankfully, the strength of Doom wasn't in the flashy visuals. It hinged on the portrayal of how Batman can be the most dangerous member of the Justice League. Because, you know, he is.
Story
Like I said, JL: Doom is Tower of Babel Lite; if you're expecting a thrilling emotional roller coaster of betrayal, retribution and redemption, you'll slightly be disappointed. You will still get it, just not in spades. What there is abundance of, though, is a full serving of 100% Batman badassery (also known as batassery). The premise of Tower of Babel and Doom are essentially the same - Batman puts together plans on how to take down each and every member of the Justice League as contingencies, and those plans are stolen and used against the league.
Doom takes a few liberties with the story, as well as a few shortcuts. The main baddie in Doom isn't the same as the main baddie in ToB, which wasn't a bad choice, actually. Instead of a slow realization building up to an "oh shit" moment, Batman quickly recognizes his contingency plans and moves swiftly against them. Cyborg was also added to the mix as the wild card. Changes like those would turn off most purists, but for a guy with a fresh set of eyes, it wouldn't matter. Objectively, the story flows well and its elements work together to give the viewer a solid experience. The main premise stays intact, and does so until the end when Batman does what he does.
Where's my coffee, Jeeves?!
If you've never read Tower of Babel, watch this movie before doing so. Don't do it the other way around to avoid disappointment.
Throughout the first half of the movie, you will feel a sense of urgency, danger and tension as the League is taken down by their respective nemeses. You know none of the Justice Leaguers will die, but seeing them suffer, indirectly at the hands of Batman, will make you uneasy. Witnessing how the mighty fall does that.
If you're a Batman fan, this is exactly the kind of thing you should watch. The guy takes out the League, brings em' back to fighting form and takes down the bad guys. He does this without super powers.
Voice Acting
If there's anything truly magnificent about Justice League: Doom, it's the cast. Lending their magical talents, they iconically breathed life into the characters they portrayed.
Kevin Conroy, the iconic Batman voice, reprises his role as the Dark Knight. Seriously, that guy should just change his name to Bruce Wayne. Tim Daly, who voiced Superman since 1996 lends his talents yet again. Susan Eisenberg, the voice of Wonder Woman since 2001, again reprises the role. Nathan Fillon, the guy who should've played Green Lantern on the silver screen, voices GL, but he did a much better job in Green Lantern: Emerald Knights. Michael Rosenbaum, or better known as "the guy who plays Lex Luthor on Smallville," has been voicing Flash since the Justice League days. He gives another stellar performance, but as Barry Allen, not Wally West. Carl Lumbly, J'onn J'onzz from the Justice League series, returns to the role yet again and does really well.
Bumper Robinson, a veteran voice actor, is the only one of the cast who hasn't held his character for a while. Nonetheless, he did a magnificent job.
Worth it?
Seriously, just for the voice acting, I would say it is. You can get it on iTunes for only $14.99. On Amazon, it goes for $18.00 on Blu-ray. Finding it locally won't be easy, though. You'll have to go to Planet X to order it.