The show is long and painful to watch. Halfway through season 2, the show, which had been great up until that point, starts to take a turn for the worst. Everything about the show gets worse. There are tons of inconsistencies that never get addressed. There are a lot of things that you never end up getting an answer for. If I were you I wouldn’t start watching the show. It gets you hooked in season 1 and then just becomes a terrible show. However, if you have already started watching, and have made it to season 4, I would recommend finishing the show. The last 15 minutes makes up for the very bad previous seasons. However, if you haven’t yet gotten to season 4 I wouldn’t recommend continuing. It really isn’t worth it.
TINY SPOILER THAT FURTHER SHOWS WHY THIS SHOW IS BAD: we never get an answer to why the plane disappeared. We get hints and at some points what seems like an explanation, but never truly get an answer. In the last scene they make it seem like it doesn’t matter, however just in case you were watching it for the answer, you never truly get it.