If you're not familiar with the source material or the musical then it's difficult to discern who the character is meant to be and, therefore, whether she may have been miscast. I certainly didn't hate her, enjoying her performance as I always do, but she did not embody the character imagined by the original screenwriter or the book writer of the musical ( I.A.L. Diamond and Neil Simon). That probably played into her lack of a Tony nomination. "
I know a bit more about the source material now than I did then I can see your point and would agree to some degree. Kristin's Fran was a different one. But all of the creative team was still alive in 2010 and I'm not sure if all were involved with the revival but I remember something about Hal David visiting during rehearsals and I would assume that they all had a bit of a say in this production, and didn't seem to mind Kristin being cast. That being said, not knowing what her character was supposed to be in the original, the story still worked for me. It didn't seem odd to me that Fran wasn't particularly mousy. After all, she's the love interest of the show. I'm not sure if we Fran we saw was just a result of Kristin playing her the way she did, or because of the vision the creative team had, which resulted in casting Kristin. I feel like they tried to make her be mousy or whatever, not even in terms of costumes, hair ect. And I'm quite confident Kristin could have portrayed that more, had it been the intention. At the end of the day, the show worked for me, everything felt natural and believable. Maybe it wasn't a replica of the original, maybe it took a different take on it. That doesn't necessarily mean Kristin was miscast.
I know a lot of people, including all the critics and award voters, disagree with me, and that's okay. But I feel like it's at least in part because people had a certain expectation of what the show was supposed to be and what kind of roles Kristin should play. This wasn't met and most people weren't willing to look at the product with a more open mind maybe and just look at the show they saw on that stage without all these expectations and comparisons. And they were a little more harsh than might have be justified.
And I'll shut up now 