I love the self-loathing antihero as much as the next person, but it's refreshing sometimes to read books about characters who are good and heroic and, yes, fallible, but ultimately strong and kind. Fer is a wonderful character in that regard; she can be childish and naive (which is totally fair because she's, what, like thirteen?) and she can be stubborn and foolish, but she's ultimately driven by empathy, fairness, and a drive to be kind to everyone.
Summerkin is a good book. It's better than Winterling in that the action flows more evenly, and Fer is given more room to shine. I generally dislike books that involve a contest of sorts, mostly because it causes the action to drag and the plot to become predictable -- contests usually only go two ways: they win (less often) or they fail (usually due to circumstances outside their control) only to triumph later through some deux ex machina loophole (more often). That said, the contests in Summerkin work, and the plot threaded between the contests keeps the action moving.
That said, and I have no idea if this is the case, it feels like Winterling was a stand alone with Summerkin and Moonkind appended on. Some of the information we're granted in Summerkin seems almost directly contradictory to what we found out in Winterling. In Winterling it sounded like the glamorie was something kind of specific to the Lady of the Summerlands? Because we meet the Huldre and she is described as having a sort-of glamorie that works entirely unlike any other glamorie seen in the series. It feels like, especially because I am most of the way through Moonkind now, that Prineas had one idea of the glamorie in Winterling and then had to tweak it to make it a plot in Summerkin and Moonkind.
Also Arenthiel??? Was talking about defeating the Mor to claim the Summerlands but like ... when was he going to get around to doing that????? Because, again, in Winterling it seemed like the Mor had been doing her thing for at least a while (judging from how long Fer's parent's didn't return for her; like time obviously passes differently in the human world but that'd still be at least a couple years). Was Arenthiel just too busy primping or something? He couldn't have wanted the Summerlands that badly.
Also, and I'm not really sure this is any flaw of the book's or just my preference, but I always find Rook's POVs much more boring than Fer's. I mean, I like Rook, but I think he's (a) a better supporting character and (b) far less irritating when we can't see into his mind. I would have liked to see more interaction with Fer and Twig, and Fer and Gnar. I love the driving relationships of the books, but I wish there was more female friendship.
I'm not going to talk much about Rook's puck-brothers other than to say they're fucking dicks. Also Rook seems to be the most un-mischievous mischief-maker ever. "Yes, I suppose I'll do this tricky thing I guess if I have to" *long sigh*. Still, I do enjoy Rook; I just enjoy laughing at him more.
I feel like I've talked about all the negative in this book, but I really liked it! It was fun to read and hard to put down and Fer is just a fantastic protagonist. I felt good after reading her story in Summerkin. The plot was quick-moving and engaging, and Prineas is a fantastic writer who uses humor deftly -- both to build relationships and to lighten the mood when the book becomes a touch dark. I'm loving Moonkind right now too, and I'm very happy I bought this series.