Excellent movie. The pacing was noticeably better than most other DCAU movies, the art style looks fantastic, and the action scenes are exciting.
I loved this movies portrayal of Wonder Woman (personally I think she's written and developed than in either live action adaptations) and the relationship between her and Steve feels so natural.
As for the Flash, finally he has a portrayal where the writers remembered that he's a genius and can do things other than go fast.
I also enjoyed [spoiler]Superman, with the callback to how the 1940s version of him was just super strong and invincible, so they never show him flying or using any of his other powers. [/spoiler]

As for the other characters I was plesently surprised with how well developed they are for being side characters, with Hourman feeling like he doesn't belong on the team cause his powers only last 1 hour, or the romance between Canary and Hawkman. With Barry and Jay Garrick teaching each other Flash tricks they never realised they could do before.

The one thing i'm a bit iffy on is the ending. [spoiler] having the movie go from fighting Nazis to for some reason fighting Atlantis felt like a bit of a weird U-turn and I feel like they did it just so they could have Wonder Woman fight Aquaman and not have to end the film on them winning the war. [/spoiler] but what they did with [spoiler]Doctor Fate [/spoiler] and the mysterious "Advisor", as well as the very end of the movie, make me think that this is the second step (after Superman: Man of Tomorrow) in another connected universe with a much more long-game threat.