I'm still working through Highway (*hangs head in shame*) but I've never had a moment's doubt about the POV. It's DC's all the way, the POV of Wives all through history, from Penelope to Cherie Blair. I know I'm risking a lightning bolt, but I disagree with Teri; Orpheus isn't pond scum - he's an innocent, a big kid who's never had to face up to big issues. I can see why Teri would have no patience with that kind of character, but that's why DC loves him, for that exuberant unhurt innocence. He's a big baby, sure, but he's an extraordinary big baby, and it's not just the stuff about getting into clubs or getting the best table in a restaurant.
Orpheus is not a jerk; he's an innocent, someone who the world has not hurt so far. Life just gives him stuff and he accepts this as nothing more than his due - be it babes or someone letting him into the VIP area of the best clubs. It's just normal. And DC loves the innocence in him, the wide-eyed expectation that the world will be good to him. I don't think she was stupid getting involved with him; she got involved with the part of him that takes an innocent joy in everything life can provide him.
Just to labour a point, years ago I was on a coach from Nottingham (where I was at University) to Sheffield (which was my home) one evening and there was a young woman a couple of seats in front of me with a little boy, and at one point during the journey she gave the little boy a biscuit, and the little boy turned around and knelt on his seat and looked at me and ate the biscuit with a degree of uncomplicated joy I''ve never seen before or since. He thought that biscuit was the best thing he'd ever eaten, and he wanted me to know it. And that's Orpheus. And DC loves him for that simple, uncomplicated joy, because it's so rare these days.
It's working fine for me so far. And it definitely is DC's story. I'm sort of half in love with her.