What it sounds like explaining Lost to someone who doesn't understand:
There's a plane crash, they are NOT dead the whole time, the island moves, uhhh characters are good
What it sounds like in your head:
Lost is the most amazing and complex show. There are so many characters and plotlines and mysteries and they make you care about all of it. The backstories and character development is done well for every single one of the characters you feel like you really know them and their motivations and the "why" of it all.