15.) “Lost,” “The End” (2010)

“Lost” frustrated fans for six seasons, as it presented storylines that often inspired more questions than answers. The 2010 series finale was no different.
At least some people could have been rescued from the island, right? Instead, they remained on the island and were ultimately all reunited. Yet the reunion came in an afterlife years later — and it did not answer the question of who made it off the island and who did not, or what exactly happened to many of the central characters.