Eh, not really. Many other restaurants have a sushi menu in addition to offering burgers and other American food.
What makes Cowfish unique is they offer "burgushi"--sandwiches that are made out of sushi components, and rolls made out of burger components. Plus the atmosphere is much more interesting than a bowling alley lol. The Cowfish restaurant in Charlotte is excellent, I've been there several times. It's wildly popular and consistently has wait times of 2-4 hours per table during weekend dinner times. And it's not even new, it's just THAT good!