Falwell was right on many counts, but he was wrong on many too. And when he was wrong, he was wrong in a way that offended a great many Christians and non-Christians alike.
For instance, he said, "“AIDS is not just God's punishment for homosexuals; it is God's punishment for the society that tolerates homosexuals."
I take offense to that. No where in the Bible am I commanded to stop people from being homosexual (either by vote or by force). I am commanded to not practice it and to not let anyone in my church practice it obstinately. However, I"m am simply commanded to shine my light to the world... not to try to force them to act like a Christian. Good luck trying to make a brier bush sprout figs.
Of 9/11 he said, "I really believe that the pagans, and the abortionists, and the feminists, and the gays and the lesbians who are actively trying to make that an alternative lifestyle, the ACLU, People For the American Way, all of them who have tried to secularize America. I point the finger in their face and say 'you helped this happen.'"
I take offense because all it does is repulse the lost from the church. Sin is going to be a part of this world until the Lord returns. That is just a fact. We all have sinned and we're all responsible for the fallen condition of this earth.
That being said, he said quite a number of good, truthful, and honest things as well... too many to even mention. His good outweighs his bad, but his bad was the kind of "bad" that offends a lot of people. I'm not talking about calling sin sin, but I'm talking about the non-biblical, inflamatory statements like the ones above.
With all that being said, I would rather sit on a plane with Falwell then Tammy any day.