This episode felt a little odd to me. Partly because I didn't even know it existed until a few weeks before it aired! I was usually very good at finding out episode titles and remembering them. But I was under the impression that the series finale was going to be just as it was in Season 1 and 4, with The End, Part 1 airing and The End, Parts 2 & 3 airing the week after. Not the case, as I eventually found out we should start pondering over "What They Died For".
This was before Sun, Jin and presumably Frank were lost, so I also thought "they" referred to everyone who had died up until that point. The other reason it felt odd was because it didn't quite build up to the fast pace that I expected the finale to be. Previous finale set-up episodes built the tension by being very frantic, such as "Greatest Hits", "There's No Place Like Home, Part 1" and "Follow the Leader". It felt quite slow by comparison. But then the finale wasn't quite as frantic as those previous finales, so it made sense.
I did enjoy it though. Apart from when we thought Richard Alpert, the important character that he was, was killed in an instant by being thrown into the jungle by the black smoke. Luckily that wasn't how his story ended. The scenes after that between Widmore, Ben and MIB were epic. Bit of a quick ending for Widmore, thought he would have gone down fighting more than that.
I think the flash sideways were my favourite parts of the episode though. Particularly Desmond's scenes, such as the final one where he breaks everyone out of custody with the help of Ana Lucia. The music in that scene is awesome, and so is the look of bewilderment on Kate's face when she sees the dress. I also liked how everything was leading towards this concert that we saw Eloise getting ready 5 episodes ago.