Only watched a couple of the documentaries. Caught the beginning of "Surviving Sharks", thought the guy was an idiot and switched to Mysteries of the Shark Coast instead! The latter I thought was a first-rate shark documentary showing the researchers trying to track sharks to discover their movements and hopefully build up enough evidence to have the area of study protected. There was also a mystery shark caught on film that was left unidentified!
The Mythbusters were also in fine form testing shark myths including the possibility of being able to poke a great white shark in the eye to make it let go. They also tested magnets ability to repel sharks.