I've never really found much interest in games like GTA, Saints Row, Watch_Dogs, and others that fit into such a genre. As such, I don't feel like I'm in a position where I can really say much about this game; it's a lot easier to find fault in a game when it's not the type of game that you would ever play in the first place based simply on the style of core game play, to say nothing of the other elements of the game.
As far as the trailer itself is concerned, I find myself agreeing with KK20 that the trailer doesn't seem to be very clear who it is targeting. From the elements that are presented and the clips of gameplay, it seems to be somewhere along the lines of a GTA-type game, but it could be something else. So, it's not really focusing on the gameplay. It could, then, be story based, but it also doesn't present much of a premise for a story outside of acts of graphic violence. As winkio said, violence is a spice that exists in media and is integral to a number of genres of story-telling in any form, but, in my opinion, it by itself cannot be the foundation of a story. So, the trailer isn't about the story. I guess really the only thing the trailer appears to be trying to sell, as far as I can tell, is the "atmosphere" of the game. It is at this point that, again, I find myself being far enough outside of the targeted audience that I'm unable to comment whether this is a "good" or "bad" game, aside from the fact that it doesn't look like something I would play.
At the very least, I do think it is unfortunate that, whether or not the game is good, it provides ammunition to those who villainize gaming as a hobby.