This is a really good show, and series 4 lives up to all of the other three series, and the Christmas special. However, this series was not exactly a classic crime-solving series like all of the others were. On the other hand, this series tied up a lot of loose ends that dealt with Sherlock's past and many of the internal conflicts that affected multiple major characters in the show.
Season 4 is the balance the writers have been leading up to all along. If you can't handle the mysteries of the mind and heart, don't watch a romance ;-)!
