*sigh*....It's pretty much what I thought it would be.
Long story short, underachieving kid gets tapped to save the world, fails every test during his training, gets "inspired", digs deep within himself, reaches beyond his potential, gets the girl and saves the day. We've seen the formula before. (All it needs is the bully to pick on Goku in the first few scenes)
I don't think anyone who is a true DB/DBZ/DBGT fan should expect it to live up to what they want. (I won't get into the whole "DBGT isn't part of the manga...." debate)
If there is a sequel, maybe they'll reveal his name is Kakarot, bring in Vegeta, the Saiyans, Super Saiyans, Cell, Buu, fusion, and the 47,836 other things they couldn't include in Dragonball but I don't think there will be a sequel unless this one makes at least $200 million.
I'll still see it before forming a final judgment but I think it'll be better judged independent of the manga/show. In other words don't compare it to what we are used to, judge it as if you never saw/read any prior DB stuff. The film was made for the masses, not the hardcore fans. (more $$$ to be made by appealing to the masses who don't know any better).