I think what turned me against this movie was that it murdered a Star Trek character. One of the humpback whales the titular meg rips apart is named "Gracie." In the CLASSIC film, Star Trek IV: The Voyage Home, the Earth is assaulted by an alien space probe that seems to be emitting sounds and songs not heard since, in this Star Trek timeline, whales went extinct. In order to communicate with this strange device, the intrepid crew of the Enterprise goes back to the late 20th Century to retrieve a humpback whale and hopefully save Earth. They arrive in San Francisco and... borrow a pair of humpbacks and bring them to the future where the whales converse with the space probe and convince it to stop murdering our planet, thus saving Earth. What were those two whales named? George and GRACIE! This is no coincidence, and The Meg has the gall to dump this heroic cetacean's bloody corpse in front of us like its the punchline to a joke. FUCK YOU, The Meg.
http://memory-alpha.wikia.com/wiki/George_and_Gracie