I don't have much experience with TS seafood but I can comment on how good the salmon entree is at Sunshine Seasons which is QS (w/the strawberry shortcake for dessert, please!). It's become my go-to meal at Epcot.
I really enjoy the lobster roll from Boardwalk Bakery which is a great value when using the
DDP.
Also not on the DDP but the sushi is really good at Kimonos Lounge at the Swan.