I have always believed that if our Orthodox faith is strong enough and that we know the difference in the two great religions that no amount of penetration by the RCC can effect our Church. Now, thats not to say that the RCC doesnt have the worlds greatest PR office which could effect even the most faithful Orthodox, it is important to know your faith and to keep to the truth.
I believe that even though some faiths might not have the fullness of 'Truth' as the Orthodox do, after all we do live in a sinful and limited world, but that each Christian faith has its own potential in trying to get others to achieve a unity with God...I say this because of the ability the Evangelicals have in reaching the downtrodden as well as the Roman Catholics with the 'structural' ability that enables them to support missionaries, hospitals, etc. So best not to knock anyone for the 'cultural' gifts God has given to them.
We should rejoice when a person is capable of achieving the fullness of the Orthodox Church, but shouldn't condemn those tending to the needs of others that might never achieve that fullness. God has His own plans and purpose.