is it really worth it to farm him?both his captain and normal special don't seem too hot
Oars is pretty much just a beatstick, but he is a fairly good one. 1440 is a lot of ATK.
That being said, as of right now he's actually the best Powerhouse F2P captain. Double Oars would come out to roughly a 2.5x ATK boost if I did my math right (please note: I am bad at math). Of course, you have to hit all perfects for it to work.
On the same note, Shadow Asgard Moria's the best Driven F2P captain available. They'll both be outclassed eventually when we catch up on fortnight units (I'd probably go for a standard 2x ATK boost over them just for the consistency), but that will be at least a little while longer.