Okay, so I just saw Flashpoint Paradox, and I want to share my thoughts with you.
The first thing you need to know is that there are numerous changes to the original story that make the 1st half or 2/3rds of this film more bearable. A lot of the plot changes are for the good and will get you immersed into the story, which flows much better than the source material--at first. There are added fight scenes that are just beautiful to watch even though the character models for every male character other than Steve Trevor, Batman, Green Lantern, Flashpoint Superman, and Flash is way too bulky. The faces for almost every male character are downright ugly. The animation itself is high quality.
Then comes the last 1/2 or 1/3 of the film that really ruins things. We are treated to changes that are just unnecessary or are in VERY bad taste. A lot of fans won't mind the uber violence in the final confrontation, but this is not a film you can show a child or even your non-comic-reading girlfriend/spouse. Some 14 year old boys may think it is cool to chop off limbs on screen or to have a hole blown through a character's head--all very graphic--but I do not. I like action and violence, but I don't see why it had to be at this level. Leave this kind of violence to anime or to live action stuff, but don't do it with the Justice League. Jeebus! DC makes Superman kill people in the most violent way in this film, which is only forgivable because he's so inexperienced, but come on, really? He's starting to make the uni-bomber look like a lightweight these days. Why couldn't it be the same kind of action we see in Bruce Timm's work or in the Incredibles? Does someone at DC really get off on this or think Kill Bill violence with these heroes in particular is cool? It doesn't even add more tension to the story... I mean, the Tim Drake scene in the Batman Beyond movie was so horrifying because they DIDN'T show it. You had to use your imagination. This is just some weirdo ****ing off to this and not realizing how dumb/creepy it is.
That's not the only problem with this film. It doesn't help that Batman's dialogue is terrible. He has some really bad jokes and is constantly drinking from a flask, like he's a wannabe 1980s bad***. Le sigh, DC, le sigh.
Flash fans have a lot to be happy about, but this film WILL piss off Superman fans and could piss off fans of Aquaman, Wonder Woman, and Cyborg. Hal fans and Batman fans have nothing to celebrate or worry about.
The voice acting is not as bad as some of the released clips show, but most of it is nothing to write home about--with regards to the main characters. The side-characters are pretty good though.
There are some really nice cameos from characters who were not in the original story or who were in the story in a different capacity--like Kaldur'Ahm, Garth, and Tula. But the replacement of Geoforce was dumb IMO.
Anyway, I give this film somewhere between a 2.5/5 and a 3/5. I can't decide.
Final verdict: Borrow it or download it from online. A hard copy isn't worth it because of the last 1/2 or 1/3.