I'm a girl that grew up watching Dragon Ball, Dragon Ball Z and GT, I was completely obsessed with it for 7 years or so, I did a lot of research about characters and stuff.... and...I don't know why many "true fans" are complaining...
first of all...Goku wasn't 5 years old on DB, he was 12 and it ended when he was 18 (even if he looked younger) it was the stupid English dub that changed very important stuff that now is making you angry cause you see no congruence on what you see on the movie...
This movie is an ADAPTATION get that fact straight. Goku was 15 when he fought Piccolo, the age makes total sense, Krillin is not in the movie cause if you remember by the time of the battle with Piccolo he was DEAD, Mai is with Piccolo cause Pilaf was the one who resurrected him, Roshi as a pervert made him a terrible character it was fun at first but it got old really fast.... Bulma HAD GUNS, AND MOTORCYCLES AND BIG CARS, if you didn't knew then I suggest you to go and WATCH what bulma and yamcha used as transport on the freaking OPENING...
Also...this is not the first Dragon ball movie ever made...What I know is that this one will not suck such as the first one (Unless you think that goku fighting a plastic crocodile is so much fun...)
I still won't judge if this movie will be good or bad, but from what I'm seeing I'll give it a chance, if not for the actors or the movie itself for the good memories of Dragon ball :3