Okay, first off, I'm not a rabid Dragonball fan, but did like the DBZ anime (although it did get superfluous quite often). So, I don't mind if for a live action update, there are things that are not in the film like there was in the anime and the magna, such as anthrophormorphic characters or dinosaurs or floating cars or whatever, or that they combine certain story arcs and leave out others.
But the least the filmmakers could have done was try to get the look of the characters right. I mean, Goku looks passable, considering it's next to impossible to find that hairsytle in real life, but the others? I mean, the least they could have done is make Bulma look like she has a blue punk hairdo instead of being a Lara Croft wannabe. Or have Chow Yung Fat actually look like Master Roshi rather than himself. And that was supposed to be Yamcha? And don't even get me started on Piccolo; I mean, how hard is it to have him look as green as the Hulk for crying out loud? The trailer flashes names of these characters along with still shots of them, but that should be unnecessary. We should know who these characters are the moment we see them on screen. And where the hell is Krillian? Why the hell isn't he in this movie?
And as for the trailer, whoever said it looked like a generic kung fu flick a la Bulletproof Monk was spot on. I mean, if you're going to have a film based off of Dragonball, then the trailer should look like the manga and anime come to life. We're talking about characters who don't just should energy beams; we're talking about characters who can fly, perform martial arts moves and super speed, and frigging destroy entire city blocks and landscapes with a wave of their hand. I mean, the last battle between Neo and Agent Smith in The Matrix Revolutions was more reminscient of DBZ than any scene we saw in this trailer and we needed to see glimpses of this. Teh reaction should be "Holy ****!" rather than "meh!"