I can see your points but people should of expected this. How many good live action movies based upon anime or video games have been decent?
I think that's just been Death Note and the first two resident evil movies. Resident evil didn't directly ripoff the games but it made mentions of some of the games content. So anyways dragon ball may be like that, not as good as the show but well enough to stand on its own. (the 3rd resident evil however sucked ass not to mention they made Wesker look really stupid.)
P.S. crazy fanboys are still going to see it even if they pirate it.
You were expecting this to follow the actual story?