Barry and Iris are still together in the end. It fixed one of Flashpoint's big screw ups, because in the comic the universe is supposedly shaped based off a mix of his old and new memories. They took that to mean he forgot he was married to his wife (and that he's forgotten his nephew exists, but that has nothing to do with this movie). The movie apparently didn't make him forget that, so I consider that a win for good writing. Maybe Justice League: War will benefit from other people getting to modify Johns mediocre storyline. I'm betting they won't start making every movie New 52. They kept movies like new Frontier in its right style, and even drew TDKR movies to look like Miller's book. I think (hope) that they'll keep going with designs on a movie by movie basis. If nothing else, dC comics doesn't control the animated films, so I don't see every movie using the New 52 style. Plus, lets be honest, New 52 DC isn't doing nearly well enough for the apparently well selling DC direct movie line to have to start copying them. I don't think we'll be seeing to many New 52 adaptation. JL is a try out, but even if its successful I don't think it will take over the film line. There isn't much they can adapt, I don't think anyone would watch adaptations of their New 52 superman or Batman solo stories.
Also, this movie was really violent. It fit the story perfectly, and I liked how they didn't shy away from it (I never expected them to actually show WW with Mera's decapitated head). It helped the story. The Cyborg/Superman moment was done very well, and was pretty sad. I liked seeing the Young Justice Aqualad in the Flashpoint universe alongside the Flashpoint Garth and Aquagirl. It reminded me of how much I miss YJ

The art was pretty good, although normal Universe Superman was a little weird and Wonder Woman's eyes were a bit to anime like compared to the other guys. I liked the voice acting. The only outright bad choice was Steve Blum as Lex. I really like Steve Blum's work, but his Lex sucked.