I just go for completed series nowadays. It's just not worth the time ranting and actively waiting for the completion of certain series. I've made a conscious decision not to start on Rothfuss's trilogy until he finishes the final book.
I also find that recently I go for books with more mature themes; not gore- and sex-fests where everyone is morally grey for the sake of it, but stuff like Robin Hobb's books which explore feminism through a fantasy lens, or stories with characters who confront their flaws rather than being some ideal version of a character archetype.