Okay, so I've been trying to catch up on all of the LOST episodes and just got to the finale last night. I know I'm lame as this has been discussed everywhere since last week. But bear with me, as I haven't read any of your blogs, nor anything on the internet.
Here is my take: All of the cast of LOST were souls who incarnated together to work out karmic issues. They created a scenario in which to do that. Thus the plane crash. All sorts of karmic events took place that included good, evil, anger, patience, etc. (I've read that souls incarnate in groups usually between 25 and 250 people. )
The last episode is the gathering of all the souls that had incarnated together. Jack's father saying some had died before Jack, and some many years later. Desmond was gathering everyone, as the last had died and it was time to reunite and "go into the light." The light being eternal consciousness.
Most everyone was happy. At some point during the show they each had made a choice between good and evil, anger, patience, etc. They had each one put another before themselves or otherwise made an altruistic choice.
Linus didn't join the group because he felt he had failed (joining the black smoke to kill Whidmore and his assistant), or because he still needed more time to assimilate the incarnation. Everyone else was happy with their progress, and were excited to see the other souls that they love dearly, and are part of their soul group.
How'd I do? Fill me in, Lost lovers.