Movies Online has a blurb about the rising number of films skipping preview releases. These releases are targeted at critics who then give reviews. However studios are increasingly choosing to not participate in these in order to prevent getting bad reviews that will sink a film before it comes out.
I knew this kinda thing happened but it used to be a rare thing and a big deal when it happened. The article points out that there are 5 times the number of unscreened films this year at this time as last year.
I have a recommendation to reduce the effect of bad reviews you get: Stop overspending on crappy movies. --Terrence Ryan