I bounced hard off their first episode. I'd say they had a series of mildly interesting ideas largely strangled by the compelling need to do an origin story for several Batman villains to make up for not doing an origin story for Batman.
Also despite being a frequent defender of the Telltale "false choice" method of making branching stories ... I felt it completely broke down in Batman. Even within the first episode, things I had explicitly not done were referenced as though I had done them and quite apart from the illusory nature of the branching, the interaction points themselves felt like they were dragging the story inorganically into stakes that had not been earned. Like the choice about whether to go to the reporter or to Gordon with no option to do the obvious thing--give the information to both.
There where numerous moments like that just in Episode 1 so I wasn't looking forward to trying the rest. If it gets better, let me know! Because aside from the "Hey kids! Did you know, Batman is sad about his parents being dead?" gubbins, I generally liked the performances and the tone.