I've been a huge Dragonball fan since it started airing on Toonami, and I just didn't like this trailer. I'm usually the kind of person who stays optimistic about everything until he sees it for himself, but I really don't like the way the writers took so many liberties with the source material.
Whenever I think of Goku, I think of an innocent man-child who would never be afraid of tackling any problems that come in the way of him or his friends. It seems to me like they made him into the typical Shia LaBeouf-style teen movie hero with almost no confidence in himself.
Also, did they really find it necessary to grind a story like Dragonball into reality? Muscle cars, leather jackets, and fully-transformable capsules don't really seem to fit in with the Dragonball atmosphere. I understand that this movie was never really meant to be a masterpiece, but the style absolutely does not flow with me.
Despite everything I said, I know I'm still gonna see it no matter what happens, whether it be for Chow Yun-Fat as Roshi, to hear someone scream "KAMEHAMEHA!", or simply because it has the name 'Dragonball' in the title.