I personally don't think any restaurant in the MK is all that good for dinner.
Along those lines, I think every resort in the MK area (via Monorail or boat) has at least one dining experience that's better than anything inside the MK.
At the Grand Floridian, we like Citricos (signature).
At the Polynesian, we like 'Ohana (family style).
At the Contemporary, we like Cali Grill (signature).
At Wilderness Lodge, we like Artist Point (signature).
At Ft. Wilderness, we like Hoop dee doo Revue (dinner show).
I'd rate any of those dining experiences well above anything inside the MK.