Plus, the villains that they're using make sense as well. None of these people need Batman around to be bad:
1. Oswald Cobblepot is a mob boss. Here, he's still a mobster just not a boss yet. I think that the show will chronicle his rise to power in the Gotham underworld. You don't need Batman for that.
2. Edward Nygma is an arrogant genius who likes to play mind games and is obsessed with puzzles. Again, you don't need Batman for that.
3. Pamela Isley is an environmental nut who has an obsession with plants. No need for Batman there either.
4. Selina Kyle is a street-smart thief, same deal.
All that Batman's arrival really does is to convince these people to put on costumes of their own and act more theatrical.