I have seen the movie!
After digesting it some, I think I like it overall, but I'll give a lot of caveats first:
1. It is super gory. I don't think any of the DC animated movies have been this gruesome in terms of blood, bodily dismemberment, gaping wounds, and exploding heads. The Death of Superman and Justice League: Gods and Monsters had their fair share of blood, but nothing like this.
2. There is blatant female nudity in one scene, including quick flashes of nipples and a longer shot of the lower body. There are also two scenes in strip clubs - one female and one male - though I don't think there's any full nudity in either of them.
3. They aren't too shy with the profanity. A lot of the DC animated movies seem to throw a couple "s" words, "a" words, and/or "d" words just because they can, but this one makes sure to get several throughout from multiple characters. It's not Tarantino level, but it's surely the high mark for this series.
4. Vandal Savage's daughter, Scandal, is in a lesbian relationship with Knockout (the object of the nude scene). They kiss at one point.
If most of the DC animated movies are PG-13, this one's definitely a hard R.
Okay, now the reasons I generally liked it:
1. There's a heavy spiritual element due to the MacGuffin that drives the story. Basically, Amanda Waller, Vandal Savage, and another character I won't spoil each want this certain spiritual item, so their respective crews are fighting for it. Also, during a conversation amongst the Squad, Bronze Tiger says that everyone's done bad things and is completely reliant on the grace of God to get to heaven.
(Harley Quinn says she knows she's going to heaven because anyone who had to put up with "Mistah J" deserves a break.)
2. I was able to sympathize with a few characters this time (unlike in Assault on Arkham). Bronze Tiger and Deadshot are the most compelling to me. They're both tortured by their respective pasts to a degree, and Deadshot wants to reconcile with his estranged daughter. Harley Quinn and Copperhead aren't that objectionable to me. Captain Boomerang is sort of off and on as far as likability, and Killer Frost is kind of a sociopath. So there was a good dynamic this time, unlike in AoA where I disliked everyone.
3. This one's part of the same continuity as the other New 52-based movies that have come since The Flashpoint Paradox and Justice League: War. In fact, there's an element from Flashpoint Paradox that plays a big part in this one, so you might want to watch that one first.
So if you like this series of movies and you think you have the stomach and strength of will to deal with the objectionable elements, I think the plot and characters make this one worth a watch.