What didn't we find out?
During season 1 we didn't know anything. We had a bunch of people stranded on a strange island where mysterious things happened.
Now we know what was going on all the time, the picture having gradually become clearer and clearer during 6 seasons. The island turned out to be a mystical source of spiritual energy that is manifested mainly as electromagnetism in the physical world. During history there have been many who have tried to gain control of this energy for their ends, but they have always been stopped by a line of protectors who are in tune with the source
That's the story really. That and the characters, who were lost in their lives, but found meaning in the island and each other. What else do you need to know? The fundamental nature of the heart of the island? It's been made clear that this is mystical/religious, so they could either come up with a whole new specific cosmology for the show's universe or tie it with and existing world view or religion but I'd say it makes a lot more sense to leave it open to interpretation.
Other than that there are just insignificant details that people obsess over. As a whole the story of Lost works perfectly well. They told the story they wanted to tell, and very competently. There's no cop out.
Totally agreed. Like I said in another thread, I suspect most people here are just upset that the show wasn't rooted more in the kind of literal, science fiction world they're used to.
And frankly, I think it's a stretch to say the previous seasons were "all about the mythology." Even then, the little mysteries were always used as a way to explore the larger issues of faith vs reason, or to further explore the characters in some way. I was ALWAYS getting a heavy mystical/spiritual vibe from this show, and I always suspected that's how the show would be resolved too.