Justice League: Doom
Not great, but I'd say it's the best DCU movie since Batman: Under the Red Hood (which is still much better). It was great having Conroy, Daly, Eisenberg, Lumbly, and Rosenbaum back again. The first time they brought any of those guys back for a DCU movie, I got kind of annoyed because I thought it confused things, these movies not being set in the DCAU and all, but then I took the nerd stick out and got over it.