Quoted from Shpwizard:Stern's last few games are not aimed at younger children, which really limits their target market. In the film industry, children's films make lots of money, far more money than rated-R films do.
Stern's last R-rated games were Sopranos & Family Guy. I guess AC/DC wouldn't be considered family friendly. However, Avengers, X-Men, Transformers, Avatar, and Tron are appropriate for children who are fans of these franchises & toys. The great thing about having multiple titles in production at any given time is you have different themes for different demographics. You've got your "bar game" with AC/DC and your "all ages/all demographics" game with Avengers.