The finale was good. I thought the rest of the episodes this week were terrible though, needed more Finn and Jake. Finn's dad and a King of Ooo are such terrible characters; worse than Tree Trunks.
Water Park Pranks last week though was one of the best this season.
Nah, Finn's dad was great, especially in the finale. He's the penultimate deadbeat dad, and his tendencies were just another piece of the overlying arc of "Going with the flow."
Orgalorg told Finn and Jake that he was just "going through open doors," and even in PB's croak dream, he (as the female bird) told the Cosmic Owl that he wasn't sure why he had to push PB off her throne, but "it felt like the right thing to do."
Martin (Finn's Dad) has the same philosophy. He goes with the flow, but as soon as things become too serious, he bails. He's not a bad guy, but (using his own words), he's "burned too many bridges" to turn back, so he has to keep going forward. Even when he tries to do the right thing (as he did with Martin JR), it becomes screwed up and he's forced to bail.
Finn is similar to his dad, as shown in the finale. He's floating listlessly in space, but rather than panic, he accepts that the universe put himself in that position for a reason. It's only after he realizes this that he realizes why Martin can't give him a good reason why he left. And he accepts that in the end.
Luckily, Finn also showed he's different than his father, as when Finn was given the opportunity to "bail" on Ooo by the comet being, he decided to stick around and live his "fleshy life." Martin, of course, jumps at the comet's offer.