I think the Catholic Church is more and/both than the Eastern Orthodox Church as the above posts indicate.
For example, the Catholic Church is both concilliar and monarchical (even each EO bishop governs as one head over his particular Church, but his particular Church is also subject to synodal decisions.)
Likewise, we see the Creed with or without the Filioque as expressing the same truth–the Filioque being used to re-enforce that meaning. On the other hand, the EO accuse us of giving it a meaning we do not (we do not intend two spirations or two principles; and we do not accuse you of making the Son and Holy Spirit the same person, since the persons are distinguished by their relationship to the others–saying the Holy Spirit proceeds from the Father without any reference to the Son could be wrongly interpreted to give the Son and Holy Spirit the exact same relationship to the Father and to each other–it also can be falsely interpreted as rupturing the unity of the Godhead).
Further, the Catholic Catechism expresses Athanasius’ view of salvation and even gives the quote Monica gives, citing both Athanasius and Thomas Aquinas.
In regards to original sin, the CCC shows that the EO accusations are not proper characterizations of the Catholic position.
vatican.va/archive/ccc_css/archive/catechism/p1s2c1p7.htm
Even EO will admit there is a difference between a Baptized infant and an unbaptized one (they will say they become members of the Church, but then the question becomes, what is the difference between a member and non-member?). Even St. Gregory Nazienzen, the great Eastern theologian, wrote of what is lacking in the unbaptized and the necessity of Baptism for salvation. If Baptism is necessary for salvation (as Christ declares), then it must supply something that is lacking.
The biggest difference, however, is in regards to teaching authority. Catholics believe this authority resides with the Bishop of Rome and the bishops in union with him. The EO do not have a teaching authority at all. Even the great Councils they venerate have no authority of themselves–they must be judged “by the whole Church.” (which of course begs the question, if the “whole Church” already knows the orthodoxy necessary to judge the Council and receive it or not, then what is the point of the Council?)
Now, a Catholic would respond that the praxis of the Church at those Councils did not allow the laity, etc. to judge them, but rather those who rejected there decrees were excommunicated forthwith. Rather this idea of councils not having binding authority came when segments (often very large) of the EO Church did not want to accept the decrees of Councils their bishops had agreed to because they affirmed disputed points with the Catholics (namely Lyons II, Florence, and pan-Orthodox councils which affirmed indulgences, original sin, etc.).
I guess the second major difference is that in the EO, we see doctrinal development up until about St. Gregory Palamas, and then after Florence we see a stop, with even some regression under the banner of anti-Latin purging.
Anyway, it bears pointing out that the Catholic Church is more accepting of the “Eastern” theological approach, praxis, etc. seeing it as valid along side the “Western” approaches (Athanasius and Anselm are equally Doctors of the Church

)whereas the Latin approach is almost universally rejected by the EO.