Sasha was a fantastic character. I loved how competent she was and the way she took everything in stride as she learned about Bruce's other side was compelling. I wasn't a fan of her going full costume but that was an excellent bait-and-switch for Murderer/Fugitive.
I still think Bruce leading her on was an incredibly shitty thing for him to have done to protect himself.
I was hoping she was the kind of character Bendis would bring back in his Checkmate but I got Kate Spencer's Manhunter so I guess I can't be greedy. I'll echo that more Checkmate with Rucka would be great.