Well, I think Steph is the lateral thinker of the Bats, the daydreamer who is more likely to screw up but is also more likely to solve the problem with someone that works much better than kung-fu or Batarangs. Everyone else has their own particular mindset to bring to the table, but Steph takes a little from column A and a little from column B and adapts, so she can scale a response to anything from Egyptian crazy-gods to drug pushers without trying to continuously force a square peg into a round hole.

If she and Cass got together as Batman and Robin, they'd probably do more good for Gotham in the long-term than Bruce is likely to (read: kill Joker a lot).

And you're talking like it's not canon that Gotham without a Gordon automatically Turns To Shit, do not pass go, do not collect 200$.