I enjoyed this movie so don't let this article I'm about to post deter you from watching -- but it's something that has to be mentioned:

http://shashalaperf.blogspot.com/2011/04/voice-tricky-topic-of-race-and-voice.html

I'm not passing a judgement on this flick because especially in voice acting, people don't need to match the race they're voicing. Case in point, Phil LaMarr is one of my favourite contemporary voice actors and he has voiced a range of different races, including the Japanese hero in Samurai Jack.

Food for thought.

Marvin does the voice of Hermes on futurama and voice work on just about every cartoon out today =) Phil Lamarr is awesome!