Sebastian is in the disappointed camp. I’m in a camp where I thought they needed to do more in earlier episodes to answer basic questions people have had since season one. But overall, I liked it. Vincent definitely made it a tearjerker.
UPDATE [By Sebastian]: I’m less disappointed now than I was last night. Really, the show “Lost” about the characters wrapped up cleanly. The big remaining questions are about the Island, namely what the hell is it and how did it get there? What’s it’s history? How does the giant wheel manipulate space and time? And how did Hugo and Ben run the Island after they took over from Jacob who took over from Jack?
But maybe in the end the Island doesn’t really matter all that much. Presumably the people on the plane got off, and lead full lives thereafter, and Hugo and Ben spent a long time protecting the Island. The sort of “flash-sideways” seems to have been a sort of parallel dimension where they were all dead but didn’t realize it, but had to realize it in order to move on.