The last Airbender

Has anyone seen tbis movie? Is it any good? How are the 3D effects? I often disagree with published reviews - and I often disagree with mainstream movie taste, that's why I'm asking you guys.
The trailers looked good, but is the story okay? I don't know the anime series and I don't care whether Asians are only cast as bad guys (I believe there was a heated discussion going on). I just want to know if it's an enjoyable movie with a half-decent script and suited for family viewing.
I enjoyed the Vampire's Apprentice but thought that Percy Jackson was rubbish. (Just to give you an idea what kind of movies I enjoy).-

Thanks in advance. :-)