I can’t say if there ever was a Marvel Event that had a satisfying ending.
There is huge criticism towards all that happened from Avengers Disassembled till Secret Wars 2015. But it is a period where readers never knew what to expect, or, what was happening, and I think that’s what will stick in the minds of everybody that experienced it. Most of Marvel continuity and history up till Civil War 2006 was predictable and formulaic, in that it had been tried before in some form. But this period 2005 to 2015 stands out as the most dynamic, controversial, and having the most effect on characters in the whole history of the Silver Age onwards. Now that may be a huge criticism of that period, in that it degraded and made heroes mortal instead of idealistic. However, it is this period that strikes hardest at the characterisations and the continuity of Marvel. Every thing before and after seems trivial in comparison.
So I don’t know whether 2005-2015 is what I call a great period. It shattered a lot of my conceptions about what super heroes are, but, it delved into areas that held my interest as much as the first 5 years of Marvel Silver Age, the greatest period to my mind, as the formation of the universe and the characters.