From my initial readings, I think that the rejection of Tariq Ramadan's visa was wrong.

Here he writes in his own defense - Too Scary for the Classroom?

Just days after 9/11, I gave an interview calling on Muslims to condemn the attacks and to acknowledge that the terrorists betrayed the Islamic message. I have denounced anti-Semitism, criticizing Muslims who do not differentiate between the Israeli-Palestinian conflict as a political issue and the unacceptable rejection of individual Jews because of their religion and heritage. I have called for a spiritual reformation that will lead to an Islamic feminism. I reject every kind of mistreatment of women, including domestic violence, forced marriage and female circumcision.