I think that food in DLR is looked upon as being not that great, especially when compared to WDW food/restaurants. However, I have never been to WDW to be able to compare, and besides, WDW and DLR are two different resorts altogether. All I know is what tastes good to me, and I like a
lot of the food in DLR. The quality of DLR has improved 110% from what it was prior to, say, 1992. The 1980s DLR food was not good at all. Now, I think it is very underrated and it is much better than food you find in other amusement parks like Universal, etc.!
That said, my choices are very much along the same lines as the previous posters' choices (great minds think alike

)!
In DL, I like
Blue Ribbon Bakery for sweet treats (cinnamon rolls!) and blended Mochas.
Carnation Cafe is a good restaurant for breakfast, lunch, dinner (try the meat loaf stack) OR dessert only (try the apple pie a la mode with strawberries and whipped cream or the Matterhorn sundae), and is in a prime location on Main Street - perfect for people watching and catching glimpses of parades.
Bengal BBQ is good for those yummy skewers.
River Belle Terrace has great breakfasts and is in a charming little spot between Adventureland and New Orleans Square.
Plaza Inn has good fried chicken.
In DCA, I really like
Wine Country Trattoria (great meatball sandwiches and a HUGE pizzetta salad big enough for 3 people).
Taste Pilots Grill has excellent BBQ chicken sandwiches and soft criss-cross fries.
In GCH, I like
Storytellers Cafe, but not for the character buffet. I like it for the off-the-menu lunch or dinner choices and the woodsy atmosphere (great burgers- both beef and veggie, thick turkey and bacon sandwiches, and really delicious spaghetti with garlic bread).
In DLH, I love
Goofy's Kitchen - my favorite of all the DLR restaurants. Great buffet with a wide variety of choices.
In DTD, I love
ESPN Zone (fabulous chicken strips and thick milkshakes).
Naples has really good and generously-sized pizza (even the smallest pizza can feed 2 or more people). And
Rainforest Cafe has great food for breakfast, lunch or dinner (try the chicken fried chicken).