Honestly, my issue was neither Talia being in the film or even her secret reveal, and it certainly wasn't the choice in actress portraying the role.
It was how she was used that I had gripes with.
Honestly, I'm up for any twist or secret reveal if it's executed well. Ducard being revealed as the real Ra's was definitely an great example on how those types of plot devices can be brilliantly portrayed on screen.
My problem was the overall characterization of Talia. When Ra's wanted to destroy Gotham, he at least had a real basis for it since Gotham was literally Earth's version of Sodom and Gomorrah and Batman still had A LOT of work to do before he could make a difference. The only real difference is that Bruce saw hope and potential within the people of Gotham whereas Ra's did not.
The Joker set out to make a point, a point that wasn't far off from the truth when you consider on how he was able to make everyone within Gotham city, good or bad, react to his methods.
Now granted, Gotham may not have been the most angelic city there is, but I honestly didn't see enough corruption within the city to justify what Talia wanted to do. She was only using her father's name and legacy as a excuse to carry out her plans, which I found to be pretty weak and contrived.
Plus, she wasn't shown doing enough on screen that could make me believe her as a serious threat and her partnership with Bane didn't make him look as threatening as I thought he was in the sense where I thought Bane was a man in control of himself, answering to no one else.
Talia's and Bane's plan was to simply destroy Gotham, it was a suicide mission. There was no hidden meaning or anything to their plans that made me question things like how the Joker's and Ra's plans did.
And it didn't help that Talia had a horrible exit at the end of the story.