They're probably the oldest and most common cereal of the last hundred years. For that reason, they're often viewed as something old and stodgy. Corn flakes may not be a superfood but with an ORAC value above 2,000 they have more antioxidants than fresh kale when you compare the two on an equal weight basis. So yes, corn flakes are nutritious! Though you should still stay away from the sugar-coated varieties (i.e. Frosted Flakes) and stick with plain unsweetened flakes. If that's too unbearable for you, it's always possible to spice them up with some healthy cinnamon and perhaps sweeten your almond milk with some monk fruit or stevia. If you want to get even more nutrition from your corn flakes, buy those made from purple corn.
USDA Database for the Oxygen Radical Absorbance Capacity (ORAC) of Selected Foods, Release 2 - Prepared by Nutrient Data Laboratory, Beltsville Human Nutrition Research Center (BHNRC), Agricultural Research Service (ARS), U.S. Department of Agriculture (USDA) - May 2010