For me, it was quite apparent that they probably wouldn't be answering all the questions once the sixth season started. I certainly knew, by the time the finale was going to air, that there was no WAY they'd be able to in a two and a half hour show.
So, in other words, I wasn't disappointed by the finale from that stand point. To me, it seemed like Lost was about both the characters AND the mysteries in the first 3, maybe 4 seasons. After that, they really shifted focus to just the characters. That's OK, I guess. But, I have to admit, for the people who got hooked into the show by the mysteries as WELL as the characters, it sucks to have had the weird, mystery vibe of the show completely pulled away, and have it move to more of a purely character based show.
There's nothing wrong with a story being both about the characters AND the mysteries. Stories do it all the time, and are able to tie things up. Look at the "Sixth Sense". Now, yes, it's probably a lot harder to pull that off in a six season show. But, starting with season 4 they knew it was going to end after the 6th. Why not start wrapping things up then?
I don't know, like I said in the other thread, I"m pretty "meh" about the finale, and thought the sixth season was pretty lacking. But, again, none of that can take away from the fact that the first few seasons were frickin' awesome TV.