Second, I still feel that the sideways stories were a complete waste of precious screen-time in the final season. It feels like a cruel joke about the common theory back in the beginning that they were all dead. Still, the bit in the church with Christian was pretty poignant. It was just a waste of half a season.
I agree pretty much totally with your post. About the above, I agree, but I'd also add that I think they added the afterlife storyline *because* they didn't have enough story and they wanted to disguise a light ending (no pun intended).
We don't really know what this long chain of people were defending or why. We do know that Jack did successfully defend the island and it seems like Hurley did too. Ok, so? While watching the show, the obvious questions about the details get washed out because you're realizing they're all dead and what's going on now?! But, later you realize that there are too many unanswered questions.
Basically, what happnened in this episode, Desmond took the plug out. Jack and co. killed Smokey. Jack put the plug in. Some people flew off the island while others stayed. No new revelations really. They all died eventually. A lot of missed opportunities.
Mr Awe