I thought Doom was great. I love that they pretty much maintained the Crisis on 2 Earths/Young Justice style of animation. It was great to hear Carl Lumbley and Michael Rosenbaum back as J'onn and the Flash. I hope they can get this group together again.
Another instant classic by the great Dwayne McDuffie. There was an awesome tribute to him on the DVD. He was a great man.