The guidebooks say that Pebbles, in the Crossroads shopping center across the street from Downtown Disney, is good local seafood, but I've never eaten there myself. Is he opposed to coming on property for dinner? If not, California Grill, Jiko, Artist Point, and Palio would be my recommendations.
The following link is for a list of the top restaurants in the area. The only restaurant with a rating higher than Seasons 52...is Victoria & Albert's! There are also several Disney restaurants included as well as other restaurants outside Disney.