If you are at all interested int his game you likely already go to Siliconera.  But if not part one of a Fan Q & A is up:  http://www.siliconera.com/2011/01/17/siliconeras-hyperdimension-neptunia-fan-powered-qa-part-1/ 
 
The Q & A gives an idea of the humor in the game.   For those worried about the dub we find out that it was done by Bang Zoom! which is as much as anyone could hope for.