The detractors may have a point: math test scores have fallen since Common Core's release, with opponents believing the standards are too high.
Of course, the true fault of Common Core is hard to determine, as parties disagree on what the root of the issues are. Some educators believe the system does not cover enough information, and doesn't suitably prepare high school students for college-level math courses.
On the other hand, some critics believe Common Core covers too much content in a compressed amount of time, giving students information overload. And because the information is so rushed, the lessons have to be taught in a vague and unclear way.