I read two books of a Philippa Gregory series a few years ago and couldn't bring myself to read a third. It was the Wideacre series and it read like V.C. Andrews doing historical fiction.
I've noticed her books are kind of hit or miss. I liked "The Other Boleyn Girl" (hated the movie) and "The Queen's Fool" but there was another one I almost gave up on...I think it was "The Wise Woman".
That one, by the time it ended, had me hating every single character. 
I did like "The Other Boleyn Girl", and really liked the characters of Mary, her husband, and George. I thought I had read all her books, but apparently not, because I've never read "The Wise Woman".
Of the royal history books, the first one I read was "The Other Boleyn Girl". After that, I've read pretty much all of them. I couldn't figure out for the longest time why I liked "Boleyn Girl" so much more than the rest until it hit me --
it is the ONLY book where the main character has a happy ending! I mean, it doesn't end well for Anne, but it ends well for Mary.
The White Queen (Elizabeth Woodville)? Has a wonderful period of her life, but doesn't end well.
The Red Queen? Has an empty life, and I guess it ends well in her definition, but in a hollow sort of way.
The Lady of the Rivers? (Jacquetta). Has some very cool experiences in life, but doesn't end well.
The Constant Princes? (Catherine of Aragon) Really doesn't end well nor does most of her life go well.
The 3 queens in The Boleyn Inheritance? Doesn't end well.
The Kingmaker's Daughter (Anne Neville)? Doesn't end well.
The Other Queen (Mary, Queen of Scots)? Really doesn't end well.
Queen Mary I? Really doesn't have a good life at any part.
And even some of the side characters, like Cecily Neville -- really don't end well either.
Only Mary Boleyn, who fell off the grid of the rich and famous, had a somewhat happy ending! (Note: I know from further research after reading the book that her true ending was probably closer to desperate poverty than to a blissful country lifestyle, so maybe she belongs in the list above too.)
Ugh. It really is depressing. If anything, Gregory probably wrote MORE excitement and happiness into her protagonists' lives than they really had, to make the plot better. So the main lesson I take from this is it really would suck to be a medieval noble woman, that you have no control over your own life, and even if you start with everything going for you -- wealth, beauty, power, etc. -- that is no guarantee of anything in your life.