For another "source", the Princeton Review shows USC as having a 65% acceptance rate and 72% of the students had a 3.75 or greater high school GPA. Clemson is 51% acceptance rate and 87% of students had a 3.75 or greater high school GPA.
Highest ratings of USC students were: student newspaper #18 Pack stadium #17 Athletic facilities #17 Study the least #17. Clemson's were : Best alumni network #2 Career services #1 Happiest Students #7 Pack stadium #1 and Love their school #2. Make of that what you will or denigrate the source if you like. Princeton Review is thought of pretty highly.