Hi duke41! Shanks is not a bad captain at all (2,5xAtk Psy units is amazing and his special is very good) but the lack of good Psy units for now relegate the Psy team (Shanks team) to places below Str teams (good atk-utility units), Dex teams (good bulky and leader) and the two dominant teams Slashers and Brawlers (versatile and powerfull).
You can run slasher team until the release new Psy units or use makeshift Psy team whit: Shanks x2" (leader, your and friend), Guimon (healer), God Ussop (staple, Ussop 4* crab path), Mohji (for some atk) and Vivi-Chopper heavy point (only obtainable spending fruits... but no other good Psy units =/).
My advice... use slasher for now but keep Shanks like a golden fish.
Hope help you ;D