The Hathaways series by Lisa Kleypas
The worst historical series that I have ever read. These books seem to be written by a clumsy child. The love stories are painfully superficial. The plots are brainless (the characters, especially the heroines, have unjustified positions, that eventually they change completely, also in this case, without reason. And each book contains an excuse of paranormal/mystery/action sub-plot that to define ridiculous is totally inadequate. I skimmed through all the books in the series because I was mesmerized by their ugliness (except for the last one that can be read with a modicum of interest) and I'm a bit sad because it's the first time that I had to be so stern with this genre.