Season 2 (spoilers)

The first 3 episodes setup a good whodunit with a clever way of creating another claustrophobic environment, they even keep you guessing as to whether or not Maggie snuck onto the boat.
But then the actions and revelations start to get increasingly ludicrous. The quiet giant on the boat turns out to have committed mass murder before! Then he snaps and breaks down a pretty solid looking metal door with his bare hands. Okay! And then he starts killing again.
After being wounded by the giant and being aware that he is the killer, Alec, the security guy has him in his sight but just does the dumb horror movie trope of just wounding him and not finishing him off. WTF!!!