Lost crashed onto TV screens with a high-concept premise — a disparate group of Oceanic 815 survivors banding together to stay alive on a mysterious island — before evolving into a philosophical rumination on, among other themes, the cost of living and the power of redemption. Then there were the Others, the DHARMA Initiative, the Widmores, Jacob, the Man in Black, and all the other mythological elements that sent fans to the forums in frantic efforts to figure out each episode’s revelations.

Even now, 15 years after Lost’s May 23, 2010 series finale, new viewers are getting hooked. But as much as Lost was a crowd-pleaser in Season 1, the series started alienating fans in its latter seasons as it delved deeper into the island’s mythology and as flashbacks became flash-forwards and then flash-sideways. But Diehard Losties stuck around until the polarizing ending, us included.

Now, after years of retrospect, we’re ranking Lost’s six seasons. (Massive spoilers ho!)