Oh, excellent thought, Stanley123. You may well be on to something. My experience is that Roman Catholics who lack a good understanding of their faith tend to be easy prey for evangelical Protestants. They cannot defend Roman Catholicism and fall for the arguments built from Bible verses taken out of context. The Orthodox aren't known for recruitment efforts, though, so I think it's more a case of those who do understand Roman Catholicism deliberately choosing Orthodox over Roman.
For example, Papal primacy. I learned in my required Religion class (at a Jesuit university) that in the early years of the Church the Bishop of Rome was "first among equals," not overlord. The original position was Bishop of an important city, with no more authority than any other Bishop of an important city. An open-minded reading of Matthew 16:15-20 makes it very clear that Peter's confession in 16:16 is the rock, and the renaming of Simon is due to his belief. Yes, Peter is first among the Apostles, but there again he is "first among equals."
From reading the Church Fathers I see a diversity of opinions - some of them later denounced as heretical - because the early Church saw no reason to establish a dogma regarding every little aspect of faith. Today, the RCC has even gone beyond establishing a dogma for everything, and is telling me how to vote in political elections "as a matter of faith." (IMHO, the Roman Catholic Church needs to lose their tax-exempt status because of this, but that's a different argument for a different forum.)
I find the Orthodox side of the fiioque argument more compelling. I won't discuss it, because I have only a tenuous grasp on the nature of the Trinity at the best of times.
Finally, I find the Roman Catholic Church to be watering down Christian life. In the RCC, Lent means no meat on Ash Wednesday and Fridays, and "giving up" something as a penitential act. But the "butter tower" of the Rouen Cathedral was built using indulgence money for the use of butter during Lent. Where I come from they still observe Fat Tuesday by making paczki, sort of a extra-rich jelly doughnut. The origin of this is using up all the cream and butter and other foods not allowed during Lent. When did the Roman Catholic Church change the observance of Lent so dramatically?
There's more, but this is long enough for now, and I haven't even had breakfast yet.