Is the Rock the Salvation of Cinema?

During the holidays, while organizing files in our home office, my wife and I played a few movies to pass the time and distract us from the tedious nature of our work.  Knowing that my wife enjoyed Dwayne "the Rock" Johnson (former entertainment wrestler), I decided to play the remake he did several years ago of "Walking Tall," that is based on a true story (with many cinematic liberties taken, I am certain, to more fully entertain the movie-going masses!)

While the movie itself is predictable and commonplace, I found myself enjoying Johnson's contribution to the film.  Relatively new to acting (his first major role, I believe, was the "Mummy" offshoot "Scorpian King," I found myself enjoying the movie much more when he was on the screen.  Yet to come close to the accomplishments of veterans such as Denzel Washington, Al Pacino or Robert DeNiro, he nevertheless is appealing in many ways.  I am not sure if it is ability to seem "normal" or,  at least, appropachable (which the other actors above have long since lost the ability to do), I credit him with allowing me to watch the entire film and not totally regret it.  Memories of the original "Walking Tall" are not so fond, as all I can remember is overacting and grimmaces and heads getting bashed over and over.

Do we need more Dwayne Johnsons in today's movies?  Is his role simply to sell mediocre movies that would make no money?  Or is it his obvious appeal and approachable personality that make me (and others) endure, or dare I say, enjoy his screen work?