Id rank PT pretty low just because its the first half of a book.
I have zero issues with a book being only part of a specific story as long as I know that in advance and don't have to wait an unknown amount of time for the next one. I don't have to know the exact date, something like between one year and two is fine, if they stick to anyway.
One issue I do have with Peace Talks is all the talk about the risk Harry is taking from Mab and the Svartalf if he gets caught. Like they say neither of them will care if he's repaying the debt to Winter, but almost everything we have seen about them says otherwise. Too-toot and the Za guards kills Aurora yet Titania doesn't hold it against them because they did on Harry's orders. In the short story Bombshells the Svartalf let a bunch of Fomor servants go unharmed specifically as they are essiantally just tools to the Fomor. (Peace Talks spoilers again) Surely given Harry's position as the Winter Knight, Mabs debt to the White Court and her orders to Harry he woul also just count as tool to the Svartalf and Mab. Mab specifically told Harry that if Lara wants to use a favour to have Harry kill someone, he should kill them, which given the event almost certainly would be a violation of the Accords. Although I kinda doubt Marcone would accept it.
Now for a more general thoughts on Peace Talks. Do you think that someone will stab Harry in the back? I think the talk of it could have been a misdirect for punching him in the face. If someone does stab him in the back, I think Carlos Ramirez is fairly likely, he seems to be the person on the White Council closest to Harry, and I think Molly's thing with him in Cold Case could be the straw that broke his back. Justine is a common guess on the Dresden Files subreddit, but given that Goodman Gray is keeping an eye on her I'm not sure she'd be meaningful. Martha Liberty is another person I think it could be, as a senior councilwoman she should have the power to threaten him, and she has a lot of mentions but no real importance.