The concept of using the Force to simply block laser fire is such an idiotically cheap-assed copout that I'm not even going to consider it as a possibility, because (among other things) there's too many instances where a Jedi or Sith could have been saved by it to say that Vader was apparently the only person who could do it. And as mentioned above, the idea of such a power is a copout. Besides, if Vader "absorbed" the bolts, then they wouldn't have exploded against his hand like they do when they hit walls, nor would Vader's hands be smoking as he catches the gun and puts it down. The armor on his suit is what protected him.
"Grant Allen [...] had written a book about the Evolution of the Idea of God. [...] it would be much more interesting if God wrote a book about the evolution of the idea of Grant Allen." ~ G. K. Chesterton, The Everlasting Man