It was a standard and was in fact, the minimum. It was a list of what kids needed to know in math and language arts. It was not a mess except where school districts went out and bought commercial products that "aligned" with Common Core standards and that is where the problem was. That was at the state and local level and was never mandated or even encouraged by the federal government. The same standards still exist to this day under a different name, because that is how states got around the hatred.
Respectfully, your opinion is obviously media driven. You said, "how the smarter kids think". That is not a standard. That's pedagogy. A standard tells you what a kid will know and be able to do. When asked to give a standard they would change, critics were never able to provide anything specific that was problematic. Many states just adopted the same set of standards under a different name and kept 99% of the actual standards intact and even used the same numbering system.
Unless you were a teacher working with it every day, you really cannot see the whole truth. There was really nothing wrong with Common Core itself, but how the education industry packed their commercial curriculums in order to try and help students meet them. That was the true disaster. They sold snake oil.