I would say that in the US though, it is a lot easier to receive an annulment

. It is rather common aswell. Also, it is rather presumptuous to say that a marriage never took place when it indeed did. It rather reminds me of the Calvinistic belief that if one loses their faith, then they never had it. Rather hard to say at the very least…
Well, or so it seems to you. I don’t know that those who preside over the tribunals knowingly “say a marriage never took place when it indeed did.” I am not sure I could even say Ted Kennedy’s annulment was bogus, though it’s high on my suspicious list. I have known people who had an extremely difficult time getting one, and people who couldn’t get one at all.
But I’m not an expert. I do recall there was a previous thread in which some felt annullments were easy, whereas there were others who argued, persuasively to me, that while there might have been an earlier period of laxity following VII, it’s not that way now. Certainly, there may be variations from place to place and, given the differences in bishops in the U.S., I would expect variations. But my guess is that those are evening out.
My impression of the Orthodox view is:
a. Adultery is a slam-dunk basis.
b. Everything else is a matter of whether the marriage is truly a marriage in the sense the Orthodox Church sees marriage; a holy union in which each party is a helper in the salvation of the other, and in which the parties are truly united in a spiritual way. In the cases in which it is not, or perhaps once was but has since, in effect, dissolved de facto, so that it may no longer truly be described as a marriage, then the Church may, out of compassion, allow divorce and remarriage, in recognition of the sinfulness of man.
c. As near as I can tell, there can be no fourth marriage, no matter what.
Of course, an Orthodox might define it better.
If I’m right about the Orthodox view of divorce, or if I’m even close, it seems to me the difference is that the Catholic Church is more absolute, not about civil divorce, which might be condoned for various reasons, but about remarriage. Except in a very limited set of circumstances, remarriage after a valid marriage is simply impossible. However, the Catholic Church looks more closely at the validity of the marriage at the beginning; in other words, “was it truly valid to start with?” The Orthodox Church seems to look more closely at the validity of the marriage midstream, whether the original marriage was valid or not. In other words “Maybe your marriage was valid when you entered into it, but is it still real?” It’s more a pastoral thing than a juridical thing.
Again, some Orthodox scholar might make it clearer than that. But, to be frank, there is a point at which I get lost in Orthodox thinking. It often seems to go unclear at a point. But I suspect it’s not at all unclear to an Orthodox. It’s just a different way of thinking about things. Latin ways of thinking and Eastern ways of thinking are just not the same.