Basically the movie isn't very good. It's dull, slow, and sometimes weird for the sake of weird. Some of the surfing shots are incredible. But it almost appears as if they were taken from other movies, like wild animal footage. I can't really say what they could do to improve the film, except for rewriting the story.
Oh, and the comma thing - Add is a "surfer dude", no comma. That should be the title. However, there's actually a line where Add says, "I'm a surfer, dude." So maybe the title was taken from half of that quote? Or the writer just likes punctuation. Either way it should have been called "Free Surfer", the name of the videogame. To me, that would have been the obvious choice. It references a major element in the story and is extremely meaningful. After all, Add just wants to be a surfer.
2 Surfers, dude.