OK, I went back and read your review. The first thing I thought was, "There is still a Blockbuster Video open somewhere?" All of those stores have closed in my town (not just Blockbuster, which went ages ago, but Hollywood Video, too). It would be downright nostalgic for me to be able to walk into one of those stores today.
We own Shaun of the Dead, so I do enjoy that type of comedy. It sounds to me, though, as if this one is aimed more at a male audience. "Girl-on-girl" action is probably a big draw for most men, but it doesn't do much for me.
That said, it sounds as if this movie would be a lot of fun for grown-ups who know what they are getting into.