I hope there's a pretty nice mix of those QTE segments. It looked pretty damn good. Shooting part didn't show enough to be excited about, but that was just a tiny snippet of gameplay, so way too early to get a read on it. I feel I have a pretty good idea of where they're going with the QTE, however. It can give the game an element that not many other cover based third person shooters possess, and I hope they take full advantage of that.
And, in anticipation of the "QTEs suck" crowd, QTE can be quite an effective tool at bringing a very cool and interesting dynamic to a game that may not otherwise exist in any other form. Done well, it adds to the game and makes it more fun to play and experience. It helps tell the story, it helps in getting the message across more effectively as to what the characters are capable of, and it gives the player a chance to feel awesome, like they have a real part in these scenes. It's a hell of a lot better than all the cool shit taking place only in cutscenes that you have absolutely no control over. They're going for something very cinematic, and obviously I'm not saying you can't be cinematic without QTE, but the QTE, if done right, are a bonus to the storytelling of the game. There's still much more of the shooting gameplay to be shown, but based on the debut trailer for this game, and with the artistic and cultural setting they're aiming for, it just makes a lot of sense that there would be more than meets the eye to the skill of the characters, and I don't mind seeing that be shown off in some flashy QTE segments. In fact, I welcome it as opposed to a pure shooter with no such QTE or other interesting element to spice things up a bit.
They also nailed the mood quite well. Even in that tiny space where the shootout occurred, the game has a very convincing look to it, not sure if it's the kind of motion blur they're using, but it just has a very nice look.