Just give Bruce Wayne an identical brother that shows up in the end
In regards to Rachel, I never minded her either, but I hoped she brought in a much more emotional pull from the audience as I didn't think anyone even cared when she died.
And as for Talia...it's tricky. I would have wanted the reveal to be earlier, but I enjoyed the mystery of her being behind such events as Fox being taken to City Hall as well as Gordon and his men. I do think Talia was hoping she would have taken Bruce to the Pit after their one-night stand though(mentioning a plan and going anywhere that night) and Bane using Selina to bring Bruce was Plan B.