I have always been very impressed by Dairy Queen's ice cream. As far as their non-dessert fare goes, it has never really wowed me, and all of the fried food seems to taste like fish, even though I didn't see fish on the menu, so I generally just stick to desserts.
That being said, their ice cream is great. They have tons of options and classic desserts. I love the blizzards. They come in several delicious flavors, and the prices are all very reasonable. The staff is always friendly and helpful and the restaurant is always clean.