Originally Posted by danoyse
This trailer was to set the tone. It needed upbeat music as much as The Walking Dead needs a laugh track.
Watch the trailers of the other films and most of them used an upbeat music especially at the end and it made the trailer more exciting.
The trailers for X2/X3 had a slow music background at the beginning then during the last few seconds of the trailer, boom! they changed the music to something upbeat when they showed a couple of action scenes. And of course there was a cool title card at the end.
If you're completely fine with the music, then good for you. But in my opinion the music they used for the trailer isn't helping that much to make the film to look more exciting.