I haven’t seen it yet, but I’d have to guess that it’s because a lot of people aren’t fans of the original and also the run time possibly. They also didn’t really give the general audience enough to go by in the trailers.
I thought the marketing was strange. The trailers didn’t really do much for me. I still want to see it and plan on seeing it soon. But from a general audience standpoint, I thought the marketing failed.
With that said, it’s still shocking that the film isn’t performing well considering the players involved and the overwhelmingly positive reviews.