It’s just that this is what would happen if Captain America were being utilized by less than noble people.
The trailer still has a lot of the things we would expect from “comic book movies.”
The twist in the trailer is so good that it makes you wish that had been able to be concealed, because it would have made the movie that much more interesting to have the reveal happen there.
Vin Diesel’s character isn’t that different from Captain America in premise.