I suspect boxofficemojo.com didn't like the take the marketing strategy for JC took, not that they believe it wasn't marketed. In fact, 1) they say that the movie's expected take is "a truly terrible start for any heavily-marketed sci-fi movie," and 2) for more than a month I've been seeing all sorts of TV ads, the entertainment news shows have been doing all sorts of segments on the movie - several just this past week alone, and there have been all sorts of online articles about the movie on the various entertainment Web sites that I routinely visit. So, in terms of the sheer volume of promotion, we should only be so lucky that DS gets as much.
What I suspect may be hurting the movie is its horrendous reviews, with some calling it the worst movie ever made. Though I can say that the movie didn't interest me in the slightest, so no amount of promotion or even the most stellar of reviews would have made me want to see it...