[quote name='Jesus_S_Preston']Season 5 was far and away the worst for me. Season 6 was hit or miss.
As far as what the ending meant, no, they didn't die in the crash.
The plane crashed on the island.
Everyone lived their lives, and eventually died. Boone died when the beechcraft fell in S1. Jack died in the bamboo field at the end of the finale. Claire, Kate, Des and Sawyer died much later in life after flying off the island. Hurley and Ben played the Jacob and Richard roles on the island for who knows how long, but eventually they too passed on.
The AU was basically a kind-of purgatory; all of the characters got to finally overcome their issues once and for all, and afterwards they all met up together with their loves/friends and together moved on into Heaven or whatever you want to call the afterlife beyond this world.
As far as why some people didn't end up at the church, they were either "Not ready", as Des said of Ana-Lucia, or still "trapped" like Michael, having not overcome their internal issues/forgiven themselves. One day, Michael, Walt and Vincent will all die and move on together too, most likely.[/QUOTE]
Your opinion about the quality of season 5 is clearly wrong, but your explanation of what happened is right on.