How so? (Cruz won the National Debate Championship for Princeton, and was in the World Semifinals for Harvard Law.)
But Rubio comes across as a human.
Rubio is a brilliant orator, he has won debates against Cruz and Cruz has won some others. Cruz is clearly the better litigator but on the stump Rubio has an ability to connect emotionally with his audience. Moreover, he has matinee idol good looks which appeals to a lot of women voters, he has a wonderful biography to tell, which he tells wonderfully well.
Without comparing Rubio to the man, let us acknowledge that Hitler was a great orator. So was Huey Long. That helps get you elected but does not make you a good man or even a desirable candidate.