I love them - I went through rather a phase of PG, but I read for entertainment as well as brain improvement!! They're easy, entertaining books. They probably aren't accurate (but she does do her research), but if you want an historically accurate portrayal of these people, perhaps you should go and read some Antonia Fraser or suchlike (which I do as well). I read for sheer escapism most of the time. They can be a bit Mills and Boon, but hey ho - life is all a bit too realistic for me sometimes, and I just like to forget about it all and escape into a book now and again!!
I agree re: Norah Lofts, sonearsofar , I've read a couple of her books that I really enjoyed, too.