The Greek Orthodox Church was very nice in my experience. The priest and parish in my town were nothing but welcoming and helpful. Although I decided not to join, I still had a positive experience with them. This church along with the Roman Catholic one are very alike in that they are both very traditional; both churches consider themselves to be the original apostalic Church. Regardless, I found the Greek Orthodox Church much more understanding of changes in modern times. It's much more sensible in my view.