There are lots of reasons why Roman Catholics convert to Orthodoxy. Some of these reasons are subjective, whereas others are objective. In my opinion, one of the best objective reasons for such a conversion is the continuity of appearance of the modern Orthodox Church with the ancient Church. The Holy Fathers were as conservative in practice as they were in doctrine. The holy Elder Paisios of Mount Athos says:
When there is a respect for small things, there will be an even greater respect towards the bigger things. When there is no respect for small things, then neither will there be for the bigger ones. This is how the Fathers maintained Tradition.
I believe that if one reads the writings of the Holy Fathers of the first millennium, they will see the truth in Elder Paisios’ statement. Even though Orthodoxy believes that her expression of Faith may develop in an organic fashion, she doesn’t endorse radical changes of her traditions. From my observation of the Western Church since the Great Schism of 1054, she seems to have disregarded this organic development and has felt no special fidelity to her ancient traditions of iconography, liturgy, fasting, forms of prayer and devotion, style of theology, canonical tradition, ancient hagiographical details and countless other minor traditions of her heritage. This is regretful and really hurts the claim of the Roman Catholic Church to be the Church of the Holy Fathers.
I encourage all people to remember to not disregard what their eyes and ears tell them when looking for the original Church. Any quote by Roman Catholic apologists that is supposed to prove the doctrine of the Papacy is only as convincing as the form of the Church that champions such a quote. The pearl of the ancient Faith will always be enclosed in the shell of the ancient Church.