But Assault on Arkham was pretty good and got me hyped for Suicide Squad
I hated it. I seem to be in a minority, but I thought it had a predictable meandering plot, entirely unnecessary T&A with Harley/Killer Frost (The sex scene, and the one where Killer Frost is topless in the morgue especially), and just seemed to rely on being shocking/gory to do anything.
I watched it with a friend who's similarly into the DC animated movies, and at the end we basically both turned to each other and expressed just how bad we thought it was. And it was pretty bad in our opinion.
As for Suicide Squad....I don't want Harley in a movie. I thought she was brilliant in Batman TAS but there have been few good interpretations of her since.