Trailers are made to exite the playerbase, thats why they have all those booms and pew pews, to make you go OMGWTF.
If someone made a project reality trailer with full action, nobody that likes PR (tactical gamers) will try it, and no one that likes runing and shooting (CoD, casuals, FH2 players
) will stick to it
.
Plus, its a tomb rider game, everyone will buy it just for the tits.