In the case of the Last Guardian it was put together with better editing, music, etc. than most games and conveyed story and emotion on a level with a film trailer. To not react to it is to turn off your appreciation for vision and sound.
I'd say the same for the Uncharted trailer - really fun and lots of story.
As for pure gameplay trailers? I've never found them interesting other than as an aid to evaluate a potential purchase. I sure don't get excited just because I'm seeing a snippet of a battle from an RPG, etc.
I guess I'm saying that a trailer for a game with a strong narrative and story makes sense, while a trailer for a pure game - i.e. its all about gameplay, doesn't make as much sense per se.
Try to be reasonable... its easier than you think...
