Basically, EA had 200 moms come into their studies and each was shown footage from Dead Space 2. The theory is that if your mom disapproves of it, it has to be good. Check out the video below:
And here's a Behind the Scenes video:
There's some more reaction videos on the official site (click "Your Mom Hates This" around the middle centre).
So, my mom actually really liked Dead Space. Just saying.