11. X-MEN ORIGINS: WOLVERINE (2009)
This film had it all: a great cast, an Academy Award-winning director, and an iconic character. The result? An utter mess of Gigli proportions. The pervasive violence and surly nature of Wolverine was replaced by CGI claws and a memory erasing bullet. Seriously.
But that’s just the tip of the iceberg that sunk this Titanic. There's also the complete bastardization of Deadpool and the never-ending cameos of useless characters (one played by Will.i.am). And while Hugh Jackman is still pretty good as Wolverine, he can’t keep the whole movie afloat on his own, especially with so little to work with.