Orthodoxy and Catholicism share many important attributes that are either missing or gravely weakened in most forms of Protestantism:
1. The threefold ordained ministry of bishops, priests, and deacons in continuous succession from the Apostles.
2. Liturgical worship.
3. Sacraments as effectual means of grace.
4. Belief in the Real Presence of Our Lord in the Blessed Sacrament.
5. Belief in the sacrificial nature of the Mass/Divine Liturgy.
6. Veneration of saints and their relics and images.
7. Special devotion to the Blessed Virgin Mary, the Theotokos, including belief in her perpetual virginity, sinlessness, and Assumption.
9. Full acceptance of all seven Ecumenical Councils held by the undivided Church.
10. Acceptance of several Old Testament books considered apocryphal by Protestants.
11. Fasting at appointed times.
12. Auricular confession.
13. Recognition that chrismation/confirmation, ordination, matrimony, confession, and unction are sacraments.
14. Prayer for the departed.
15. Belief in a visible Church.
16. Celibate episcopacy.
I am hard pressed to find very many areas in which Orthodoxy is closer to Protestantism than it is to Catholicism. Two that come to mind are the enumeration of the ten commandments and decentralized church government. Thus, I would say that from an Orthodox perspective, it is better for a Protestant to become Catholic than to remain Protestant. Furthermore, with the important exception of point #9 above, I think that Eastern Orthodoxy and Oriental Orthodoxy have much more in common with each other than either of them do with Protestantism.