Oh, your sentence is impressive enough already! It's correct, but perhaps it should be a little less impressive, along the lines of what Constance and Brian are suggesting.

Your sentence is fine. There are no errors, and it sounds formal and academic. But an alternative would be: There is no consensus as to whether university students should be required to attend classes, but I strongly believe that attendance should not be obligatory.

Although opinions vary, is my firm conviction that university classes should be optional for students.