I think one of the main issues that many people have with the RCC is not that they are not perfect, but that they appear so hypocritical. They claim that they are the only true church, the representative of Christ on earth via the pope guy, yet they don't follow the very clear and very basic teachings of God's Word on what to do when someone in their midst blantantly sins (and a most disgusting and vile sin) much less one who is supposed to be a shepherd of the sheep. And it wasn't just one instance, but occured mulitples of multiples of times over many years. The fact that they have never repented nor confessed that how they handled this evil person must be addressed before they can be taken as ones who can be trusted to speak for God.
And you shall know them by there fruits.
-A8