Metal is the story of a group of evil Batmen, coming to Earth from their Dark Universe to corrupt us all and drag our cosmos down into the black, unforgiving void. In the comics' version, things went one way - the JLA of our world prevailed. But in DCUO, we actually have access to a team of GOOD Batmen to battle the Metal Batmen! Yes, it's high time to bring back The Council of Batmen: Ninja Batman, GCPD Batman, Primal Batman and Steampowered Batman. Heck, throw in Future Batman and Alternate Earth Batman from Family Reunion! We could fight Bats with Bats! (although of course, as always, it's the player characters doing the heavy lifting) Can you imagine Kevin Conroy voicing all of these characters?
He's an actor! If Ed Asner can play Granny Goodness, why can't Kevin Conroy play The Drowned? (Maybe there's a parallel universe version of KC ... maybe a Karen Conroy? )
would detract too much from the story, a lot of the ante and drama/plot in dark knights metal is that not only do the league members have close ties to each respective evil negative universe bat man, but essentially they are also a statement about bat man himself/said respective league members. it would simply take way too much of the impact of the plot without really adding anything meaningful back to it.