Like I also said, these differences (whatever they may ALL be) were enough to cause a split nearly a thousand years ago that has never been rectified. Being that I am not a Greek/Eastern Orthodox member, it's not my place to teach you all about that. From the reading that I have done, I can say that they sound MORE orthodox than Roman Catholicism. They sound like they have remained MORE faithful to the ancient Christian faith than the RCC, though I have no desire to join up with them.
If you are interested, here are a few more links that describe the differences:
http://www.ocf.org/OrthodoxPage/reading/ortho_cath.html
The "split" had as much to do with politics as it did with theology. And, in an odd twist, the excommunication of the Patriarch of Constantinople by the Papal legate was not even legitimate, because the Pope who commissioned him had died in the meantime. History has many strange quirks.
I am very familiar with the differences between Catholicism and Orthodoxy, having spent considerable time on an Orthodox discussion list heavily populated with ROCOR Orthodox.