I think I'd rather have a series which focused on a smaller cast of characters and really developing them than a balls to the walls everyone is here Super Smash Bros. Ultimate Gotham crossover. Maybe in a season 2 they could start to bring in more characters and do something like 'city of Bane,' but I'd keep things smaller for season 1 and have Tim and Steph grow into their roles, not throw them off the deep end at the start.
Also, I have this image in my head of the trailer for the show ending with Tim slowly saying 'holy,' only for it to be revealed in the first few episodes that he says its the first time he sees Steph take down a group of mooks.