All of them featured a lead actor in physical combat with a much smaller opponent. Does three make a trend? Anyway, I like the idea that the hero of the story isn't such a triumphant fighter that he always goes up against the odds.
Another welcome development I think I've noticed is more movies without a gratuitous sex scene. If it's an integral part of the movie, fine, but otherwise I'm glad the studios are dropping it.
All three movies were pretty good, by the way.