From what I am reading the trailers absolutely did the film justice and represented it to a "T". What seems to be at issue is that a lot of people didnt want this movie as is (Harley Quinn featuring the BOP) so they shut themselves out to the film and wanted to wait to see if others liked it before they let themselves warm to it. Happens all of the time, nothing wrong with being skeptical ESPECIALLY if it is something you hold in high regard like many BOP fans do.
I think another issue is that many fans are still kind expecting the massive marketing campaigns WB was throwing out for movies not that long ago. Under the old regime this film would have been plastered everywhere, with multiple trailers being shown and overly produced. The budget would have been $40-50 million more alone on the backs of said marketing. With the new plan at WB of having smaller budgets for ancillary stories they also tone down the marketing which probably costs them some box office but also makes it easier to green light sequels cause the threshhold is much lower. I mean if this film makes $200 million it makes a profit if the current budget is to be believed. WB seems to be less in the "LETS MAKE A BILLION ON EVERYTHING!!!" mode and more on the "lets just see what connects and THEN blow the doors off this thing" mode.
I know it isnt the BOP of the comics, and I know that ticks people off but Margot could have just made her Harley film and been done with it. She championed this and is about to give those characters more exposure than they ever could have gotten on their own. This is a good thing for the CBMs and the industry as a whole.
