Board Thread:Arrow discussions/@comment-25088123-20161104223932/@comment-24152851-20170120075002

Gotham was actually less grounded than Arrow Season 1, which was so down to earth that you could never have imagined it'd end up with particle accelerator inducing superpowers, resurrection pits, magicians with blood magic, or time traveling misfits screwing with history.

Gotham is different from other DC shows in that it focuses on Batman lore in general, from Jim Gordon to Batman's Rogues, rather than on the one superhero. But in terms of "realism", season 3 is just as out-there as Flash. I agree they usually restrict the "source" to mad scientists, but the by products aren't any more feasible than the villains-of-week that Barry faces.