Stevens take is shared by a lot of lawyers. Whether it was fair or unfair that Kavanaugh was placed in the situation of being questioned, his performance made many question whether he has the temperament to be in the Court.
Irony is, if there had been an opportunity to do a thorough investigation before the hearing, then its possible that anything that was really not credible would have been dismissed prior to the hearing. From that perspective, I thought he made a strategic mistake by not pushing for the investigation himself. Given the limited investigation that was done, at least one side of the country will be raising questions about him the rest of his life (which will not stop after his confirmation). A failure to interview many of the alleged witnesses will probably lead to at least some of them making public statements, further keeping questions about him in the public. If Kavanaugh really did not commit any of the alleged acts, that is truly unfortunate for him and his family.