The first Manhunt is a mediocre stealth game propped up by its atmosphere, horror elements, and general shock value. Manhunt 2 drops the horror and atmosphere in favor of pure shock value, and the result is a forgettable stealth game with an unappealing aesthetic.
Mechanically, it's basically the same game as the first. You use sound to draw enemies near, use shadows to hide, and then you hold an execution button to change the severity of your attack. The new features are aerial executions and environmental executions, but they fail to improve the encounter design in any meaningful way.
The story is less intriguing this time around and you'll have a hard time caring about characters or their motivations. It deals with elements of redemption and family, and it's an awkward combination with the high levels of violence.
Ultimately, Manhunt 2 is a game that lacks meaningful improvements over its predecessor and one that fails to provide a worthwhile experience in its own right.