There are two possibilities here: either they did a laughably awful job on purpose for the shiggles (most probable), or they are genuinely incompetent. In other words, they either deserve 1 star or are desperate to receive one, so who am I to deny them? This is a movie about a shark that looks like an angry uncooked breakfast sausage that is also radioactive, go into it with low expectations and prepare for it to fail to meet even those.