Weekend Box Office (06/17/12): Rock of Ages and That's My Boy tank while Madagascar 3 remains strong and Prometheus plummets.

I try to remain somewhat positive about box office, if only to counter the relentless 'It's a bomb!' or 'Big Star FAILS!' punditry that makes up much of the box office pundit world.  But there is little good news to report about this weekend's two big releases.  The top new release was Warner Bros' broadway adaptation Rock of Ages.  The 80s rock homage pulled in just $15 million.  Now to be fair, while the film's opening is far below the $27 million debut of Adam Shankman's last musical, Hairspray in July 2007 as well as the $27 million debut of Mamma Mia! four summers ago, it's actually the sixth-biggest debut for a modern musical, which shows how rare they are even in a post-Moulin Rouge era (Moulin Rouge opened with $13 million eleven years ago, by the way).  It's a bigger opening that Rent ($10 million), Dreamgirls ($14 million on under 900 screens), Burlesque ($11 million), and Sweeney Todd ($9.3 million on 1,249 screens).