I just finished watching it, thank you, Internet.
In contrast to you, I think Robin was my favorite one. I really liked him and I see him carrying most of the show with clutzy Kid Flash. Superboy's the bitchy one, Aqualad's the calm one, Miss M's the cute one.
The animation was an odd thing because it looked really good at some points but awful and cheap in others. If you watch it again, pay attention to the ending where Supes flies in. In one shot w/ Supes, WW, and Martain MH, they all look terrible. Supes's torso looks way off and Wonder Woman looks like shitty fan art. In the next scene, the Flash's body also looks awful. It almost seemed like they rushed the art in the end.
Too bad they didn't air this a month sooner because all those creatures screamed Halloween.
As much as I like seeing the JLeaguers, it felt like overkill. I kinda wish we had seen everyone at the Hall of Justice and then in the ending we just get Bats, Supes, and maybe MM. I don't think anyone else really had to be there save Red Tornado and then Black Canary at the end.