Ala Mhigo Arc fell flat on its face, especially after the great job that was the Doman Liberation Arc.
Lyse had more personality when she was her alter ego and felt like she was just there for the sake of being there whereas all the other figures, such as Hien or Ruabahn had much more depth to them by a mile in comparison.
Yotsuyu's arc had its hiccups but wasn't the worst story ever and I'd be lying if I didn't get a lot of satisfaction watching that parasite's death, although I felt bad for Sad SAM.
Scion bit at the end and the whole Garlean affair was very interesting.
Pretty much, what you got to look forward to in SB are a handful of Diamonds buried in a mountain of dirt. After the grandeur that was the HW story, SB is a bit of a let down. It has its high moments to be sure but never really reaching any point of HW's high points.