Brian123:JamesOK:
Could someone explain to me what on earth happened! Was the Island a real place? Was all that stuff about the light actually real or not?
My interpretation is that everything that occured on the island - the initial plane crash, the Oceanic Six leaving and returning, the plane taking off at the end, plus all of the flashbacks really happened.
The parallel storyline which ran throughout the final season (where the plane didn't crash) was essentially all the characters living in a state of purgatory/limbo after they had died - some of them who had died on the island and others who had died years later. Desmond's job seemed to be to bring them together in order to get them to remember their time on the island (I'm not sure if he was meant to be some sort of spirit guide or not). after which they all met up in the church to accept their fate and 'move on' as a group to the afterlife. Presumably Ben stayed outside the church because he felt guilty for all of his actions and wasn't ready to move on.
If you can, I would say go back and watch the last 20 minutes again, in particular the scene where Jack meets his father - it certainly makes a lot more sense the second time round!
Thanks Brian, I think it makes more sense after your explanation. Admittedly I am not sure whether I have the energy to watch any of it again! I am pretty much of the opinion I've wasted valuable hours of my life watching lost for the ending we eventually had!