why would you be committing sin by watching him? he is regarded as a very trustworthy source on church teachings, and has won awards in Catholic theology,
although maybe you have heard of a couple of diocese disapproving of him, well, i actually met him last week at one of his talks, and he explained it himself, those bishops who disapprove of him have never spoken with him or anyone involved with his show, there has never been an exchange of communication between him and their diocese.
the video that he explains that on should be aired tomorrow, Saturday, and Sunday(or Monday), so just watch that to get the full story.