Scenic not until you get to Wyoming or Colorado. Kansas and Nebraska are in the way.
I have been several times. My suggestion is take a look at the states and what they have to offer. Then plan your trip based on what you want to see. You can do several lifetimes of scenic in Colorado, Wyoming and Montana. On our last trip we chose what we wanted to see one last time (Mt Rushmore, Devils Tower, Old Faithful, some of the canyons in Colorado, etc).