I've only ever been in it for Jamie 
Brianna is just so high maintenance. She could have forgiven Bonnet without making a big show of telling him. However, that sets up the whole future story line between them.
Roger is an idiot and he doesn't really get better. I've never really bought into their relationship. Even in the books it a bit implausible, to be honest. Sometimes I think that Brianna doesn't even like him, never mind love him. I just don't find them that convincing or compelling. And his sudden calling to the ministry is a load of bullocks. He just likes the status and respect it brings him from his C18th protestant community. Especially as he is surrounded by Roman Catholics.
The prices is an idiot, too. Although, to be fair, he puts his faith before his life, which I do understand. It's a theological argument, isn't it? He feels fallen from Grace because he sinned and broke his vows. Therefore he can no longer perform the sacraments without polluting both them and the other people involved. So he can't christen his baby because he believes that would damn her to hell. There seems to be no room for God's forgiveness in his theology, though. I don't know enough about Catholic theology, but, at that time, protestants believed in double predestination. So you were either damned or saved before you were even born and nothing you could do could change that. So I don't know how any of it hangs together in church doctrine or dogma. It's all a bit extreme, though.
I wish they had made more use of Jamie and Claire this season. They feature much more prominently in the books than they have in the show this time. It's a real shame because their's is the relationship that the whole thing is built around. If we don't get Jamie helping at the birth of brianna's child, the writers will have a fight on their hands to find a way to heal the broken relationship between him and Brianna in as strong a way. Also, I miss his pecs (very shallow, I know).