I'll say this:
My wife has been reading a 1st Person POV series ... Kushiel's somethingorother. Not my bag, so I haven't read any of them.
Apparently the first book or two were from the POV of an adult female character, first person. She thought they were well done and quite interesting and she liked the character.
The most recent book, the POV character is apparently a young male child. But, she says, the author voices the character like he's ... an adult female ... she literally put the book aside and said it was unreadable. She didn't like the character, she didn't like the change of viewpoint, and the author went into something that she may not have been able to pull off.
I would have put the Dresden books down if Murphy had been the POV for book three and Thomas book six. I'm not as interested in those characters, as main characters, as I am Harry. If I pick up a book of the Dresden Files, I expect it to be from Harry's POV. When I pick up the first book of a series, it's just me, but if it is in first person ... when I go to the next book, I'll be expecting the same main.
Now, a great author might be able to pull me back in, but I don't even like it in 3rd person narratives. When I'm reading about Main Character 1, and I get into his story, if the next chapter is Main Character 3 ... I want to skip the chapter and look for the next one with the other guy. All of my favorite authors stick with one character for a whole book, if not a whole series.
--fje