A lot of the actors today who are in their 30's, like me (especially Black, Stiller, Vaughn, the Wilsons, Ferrell, Affleck, Damon, etc.) grew up on the TV shows, movies and comic books they're recreating and remaking these days. So it's a bit of a labor of love for them. For example, you can easily see just how much fun Stiller and Wilson had making "Starsky & Hutch," and there are plenty of other examples.
Me, I grew up on that stuff as well, and so I don't mind these movies. Nothing wrong with a little nostalgia now and then.