This is a tough book to review because my opinion is definitely colored by the weight of expectation. I've been waiting for this book to come out in paperback to finally dive in, so this has definitely been something I've been anticipating. 
 Let me preface this my saying that I am a huge fan of the Fug Girls. Their blog is fun and insightful and has the perfect balance of snark and respect (to this day, their review of the Lindsay Lohan Liz Taylor movie is one of the funniest things I've ever read). I love that they take no shame in covering and obsessing over the British royal family as it's one of my personal guilty pleasures. Add in my adoration for romantic fiction, and I am basically the target audience for this book. 
 Let me also say that this book was incredibly funny, well-written, and at times, moving. So why didn't I like it more? 
 I think the main reason is that the storyline and many of the characters are simply... generic. I've read a lot of romance over the years and this one hit pretty much every trope of the genre. "Cool girl" heroine? Check. Meet cute? Check. Disapproving parents? Check. (view spoiler)[Secret blackmail plot? Check. (hide spoiler)] I have absolutely no problem with adhering to the genre and some of the most enjoyable parts of reading romance is how writers can adhere to and subvert the tropes, sometimes simultaneously. But other than some cultural shade, this was pretty much a by-the-numbers contemporary fiction, without any irony or satire . And whether fair or not, that was the style I was expecting and hoping for and in the end, didn't really really receive. 
 Some other reviewers have hit upon some of the other issues - the strict adherence to the Will-and-Kate narrative, the supporting characters outshining the main ones, and some narrative choices that border on offensive since the plot sticks so closely to reality. The book is a bit long, which is fine for a story supposedly about an epic romance, but (view spoiler)[ when the 2 main characters probably spend only about a 1/3 of the pages actually together, it's a bit difficult to get attached to their relationship (hide spoiler)]. I would have less of a problem with this if there had more of a commitment to the journey of the heroine but I didn't find she actually changed or grew much from beginning to end. Also, (view spoiler)[the middle portion where she goes on an intercontinental bender after their breakup really ruined her character for me; it had been built up and mentioned so many times how "normal" and "girl next door" she was, but this felt like the actions of a different character and really, a different book (hide spoiler)]. 
 I definitely think this a book you can enjoy if, unlike me, you come without any preconceived notions or expectations. As mentioned, the writing is spot-on and often laugh-out-loud hilarious, with all of the one-liners that make Go Fug Yourself such a blast to read. There is a storyline around the middle the book that truly made me cry and (view spoiler)[is an incredibly moving portrayal of grief (hide spoiler)]. The personalities and voices of both Fug Girls shines through the writing, not an easy thing to do when co-writing a book.