Some additional thoughts:
Big River Grille - Ate a nice, casual lunch here on our last trip staying at BWV. I wouldn't go out of my way to eat here, but good if you're staying at the Boardwalk or in the area.
Captains Grille - Ate here once for lunch on the Deluxe Dining Plan. Literally between my wife and I for all three courses one item was good and one item was terrible. Will not go back -- 50% is too low of a success rate for a meal.
Kouzzina - I think this one is a matter of personal tastes, maybe moreso than other places. My wife thought her chicken dish was too sweet. My greek lasagna was sweet as well, but I like sweet foods and really enjoyed it. And I really liked her chicken when I tried it.
Kona Cafe - I think our favorite non-signature restaurant. Never had a bad meal in four tries. Sushi menu is good as well. HIGHLY recommend.
Mama Melrose - Hit or miss, a little more on the miss -- in general we just don't think their tomato sauce is that good. If you can stick to other items, it's not that bad. (They have a pipette pasta with cream sauce and chicken or shrimp that is pretty good.) It's too bad Tutto Italia may not be open, that is MUCH better than MM.
Overall these reviews may sound somewhat critical, but in general we're of the camp that the dining in WDW is actually quite good. You say you're rounding out your ADRs, so hopefully the rest of your choices are on our good list.

Enjoy!