Sunshine Seasons and Yakitori House both have when I'd call "supermarket sushi". I don't care for it when there are fresher alternatives.
You can get better sushi at:
California Grill at the Contemporary resort(expensive, but good)
Kona sushi bar at the Polynesian resort (open only at dinner hours.)
Tokyo Dining and Teppan Edo
Wolfgang Puck Café (Downtown Disney West Side, not Marketplace)
Kimono's at the Swan resort (again, dinner hours, maybe 5pm-ish; becomes a karaoke bar later)
That's what my brain is coming up with at this late hour. I think Kimono's has the best variety and more traditional offerings. The first two I listed have limited but creative offerings.