This is one of those things that seem great in theory but end up being not so great in actuality.
I'm not even a DBZ fan, but i've seen a couple of trailers and it looks very ... strange.
I remember when I was perhaps around 11 or 12 and I was disapointed that the actors in the live-action "Super Mario Bros." movie didn't look or act the same way as they did in the games.
"Goku" looks like he can get his butt ripped apart and then put back together again. o_-