I think it's safe to say that many fans were disappointed with the trailer that released for Michelle Yeoh's upcoming movie, Section 31. First, the music was different than anything Trek had ever used. Only one other Star Trek series had ventured outside the overtures usually created for the franchise, and that was Star Trek: Enterprise. We all know how well that went over.
Second, fans said the trailer and the overall feel of the movie didn't look like anything belonging to Star Trek. Some compared it more to Guardians of the Galaxy and the Marvel Universe. But the trailer only includes a few snippets of the movie. And there have been plenty of other movie trailers that didn't fully represent what the movies were about. For instance, the trailer for Godzilla (2014) included a lot of Bryan Cranston, making it seem like he was one of the main stars, but he actually only had a few scenes in the movie. [Per Buzzfeed]
And how many times have we seen scenes in a trailer that never showed up in the actual movie? Scenes are filmed and then cut from the movie for time or other reasons. Screencrush has a list of movie trailers that included scenes that didn't end up in the movies. One of those was The Amazing Spider-man which got everyone hyped about the possibility of learning more about Peter Parker's parents, but nothing was included in the movie.
So aside from the music used in the Section 31 trailer, if there were scenes that were off-putting, those might not even be a part of the movie. Also, taken out of context, some scenes don't play well by themselves. It's entirely possible Section 31 will be a vastly different movie than what we saw in that trailer, and shouldn't that be something we judge based upon the actual viewing of the movie instead of just the trailer?