sorry, not trying to be polemic, but i do think they have far more complaints about rome than we do about them!
It's not about which side has more complaints against the other or even which side has the better complaints. Someone can correct me if I'm wrong, but I believe the Eastern Orthodox have held to the same position toward Rome & Peter from the beginning, first among equals. It allowed the Church to generally act as one for centuries, with an eye plucked out here, a foot chopped off there, but the body itself remaining intact.
If that form had remained, Rome would have had others equal to Her to keep Her in better balance & as the Church in the West expanded, those closest to populations would have been the ones with the power over the portion of the flock in the varied locals.
The Reformation may have never happened under those conditions, as it was in large part a response to a heavy hand, voices in the wilderness against an unbearable yoke unknown to those under the Patriarchies of the Eastern Orthodox.