Good but not great
Just watched this a a couple days ago. I really liked the idea for the show but the execution wasn't the best. I would have really liked to see it run a bit longer and the art which looks like it was right out of the CN show Young Justice was all right; but not quite in line with the incredible work that has been done by DC Studios in the past. I have to say that this is one of the voice acting jobs I've heard from a group on something like this. I would really love to see Nathan Fillon reprise his role as Green Lantern; he was great.
I really loved the movie. But it's definitely not something I would watch again. I just hope they will do another Legion of Doom premise in the future. Because it works really well in a team movie context. If you have a chance to rent the movie I would. But I certainly wouldn't buy it.