I agree 5th season was boring! and firstly, PREDICTABLE!!! we knew from episode #1 that Dave was the husband of the woman that was killed in the accident, and that he was seeking revenge from Susan/Mike...
and honestly, the Dave plot was really week and boring! I like when new families come, and they have all those secrets that slowly emerge..
and i believe thats why this season will be great and exciting again! The new family looks really creepy and it looks like they hold a lot of dark secrets..