I think that the best part of it would probably have to be the sci-fi elements. The un-realistic stuff. Without that, Lost just isn't LOST. To me Lost would just be another mostra without the sci-fi elements! :)
I think the best part of it was that it was so..original, unique, I mean what other mostra te could compare with Lost? Probably none :D It was something totally different from other shows, not just a story about few people stuck on the island, it was much more, and we all know that...So I think that was the best part - originality:)Another amazing thing was their ability to surprise people, there were so many times when I expected one thing to happen and at the end it was completely different, and I loved that too, I Amore to be shocked :D And all other things in Lost were amazing, I loved this show!