I am often at odds with other Anne Rice fans with reguards to which stories I like.
I loved Pandora, but I still thought Blood And Gold was great, I don't feel it merely re-treaded old ground, covered in Pandora and The Vampire Armand. I actually added it up and more than half of Blood And Gold details events outside of those books. And the parts that do retell scenes from Pandora or Armand are different, because they are seen from Marius' point of view. I've always loved his character and it's nice to get to know him a little better.
But this isn't about Blood And Gold, this is about Blackwood Farm.
If you hated Blood And Gold you might not like Blackwood Farm, not for any strong similarities, but if you are one of the people who feel that Rice's writing has gone downhill, I don't sense any major difference between this and her other recent output.
I loved Blackwood Farm. I loved the intimate nature of experiencing the family's history without the tedious charts and family tree of Mayfair Witches. After a while I felt at home in Quinn's house.
I like the character Quinn, and I loved reading about his past, his teachers, and especially Mona.
I didn't like the vampire that sired him very much, but that's more personal taste than anything.
I should also note that I started reading Mayfair Witches *after* I read Blackwood Farm.
But if you are like me, and you didn't mind Memnoch The Devil, loved Pandora, had to fight through The Vampire Armand (all the boring descriptions of Vennis and it takes so long for him to become a vampire), and liked Blood And Gold, for instance, then I think there is a good chance you'll enjoy Blackwood Farm.