My Hero found that Anora shared most of his views. So he saw very little to dislike about her. He married her. The only thing he didn't care for was her attempt to downplay his position, which was king. But he also understood that it was difficult for her to trust anyone after she was betrayed by her own father (and her husband repeatedly before that).
And of course I agree that the speech before the Battle of Denerim was like the claws of a hundred screaming cats on a chalkboard.
All I mean is that I find her saying I'm being unreasonable to be silly after her promise of support and subsequent backstabbing. There's no reason for me to trust her after that, so what I did in my position is being reasonable. If she really wanted to complain about the future of Ferelden being in jeopardy, she could have done so in different words.
She believed her political tactics were completely reasonable. She thought your choice was bad, so she sided with Loghain, who appeared to be the better option by that point. Nothing that happens between that point and the Wardens beating and possibly killing Loghain changes her opinion about Alistair being a bad choice of leader.
And in fairness, if you go against her the whole way and yet Alistair dies, she gets the crown and yet holds no ill will against you or anyone else.