I've read a lot of Alison Weir and yes, she is extremely (in my opinion) bias in every one of her books. Anne Boleyn can do no wrong, nor can Elizabeth I, etc. She is very bias against the Woodvilles (especially Elizabeth). I became interested in this period because of The White Queen. I've read books more recent books about the Woodvilles and Elizabeth because they've been cast as the most "infamous family in England" by most historians. Anyway, Alison Weirs' War of the Roses is bias towards Margeret and against Elizabeth. One surprising thing about Alison Weir is that she believes Richard III guilty of the murder of the Princes in the Tower (Elizabeth Woodvilles & Edward VI's sons). I think that particular book is "The Princes in the Tower" though.