IMO, down-playing the villain and hyping up the hero (at the former's expense) for an upcoming movie, is a stupid move. It dilutes the thrill and sense of threat. Typically, there should be an atmosphere of great challenge and even hopelessness surrounding the "boss fight", that piques the would-be audience's interested.
The latest terminator movie, for example, did the same mistake (well, it did many other mistakes too, but this was one of them). Every trailer was basically about how the "big bad" got his ass kicked in various ways. Way to kill the hype.