If you thought the first two episodes were slow it might not be for you. Keep in mind the teens were stranded for over a year and a half, and the writers have a 5 season outline, so it's going to have some build-up before the real crazy stuff happens.

That said, I do think it continued to improve as the season went along. There are a lot of interesting characters in the show and the overall mystery in the adult storyline is pretty solid. However, I was hooked just from the first episode so take that as you want.