I liked seeing Sam and Dean separate. We don't see much of Sam and Cass. It had some funny bits but the end of their plot was just so...unimpressive. Also i can't stand anymore nerfing, i can't, Cass can make then fall asleep with a touch but the writers think we want a boring action scene. I get it, him just tapping them is boring too but the fight scene is worse.
As for Dean and Jack it was too much talk, its too much melodrama.