Oh right, forgot all about that incest thingy. His sister had feelings for Dexter, thanks to a psychiatrist that pointed that out?Since this is SPOILERS anyway, I'm not gonna bother using SPOILERS.
I liked the last season but there were some things I just thought were dumb. The whole incest story arc thing was dumb as shit and it was a bit slow until the big plot twists hit in the middle (Travis teams up with Dexter, Travis turns out to be the killer the whole time). The cliffhanger was awesome though and next season should be great.