I know Orthodox often reject the notion that Christ was a sacrifice to God...On what basis do you make this statement? This doesn't sound like the Orthodoxy I know.
I believe the (Byzantine) Orthodox held a council to respond to Anselm's satisfaction theory. In it, they rejected the idea that Christ was a sacrifice to God the Father
specifically, instead maintaining that Christ died as a sacrifice to the entire
Godhead. The former idea, which was Anselm's, divides the Trinity too much and results in the "good cop/bad cop" view of the Son and the Father that has characterized the West for so long.
I'm not sure but I think this may have also been the same council that defended hesychasm against Barlaam's attacks. If not, it happened around the same time.
So the Orthodox (EO, anyway) would say that Christ was a sacrifice to God, if
by "God" we mean the entire Trinity, rather than just the Father.