The pitch video only represents a fragment of SG, so no, I don't agree that 10 minutes of "research" is always enough to get a proper image of what a game/movie/whatever, is about.
But there is a difference between a proper image, and "getting a feel".
For instance, the pitch tells us(me) that sg is an isometric action rpg, with focus on combat. (hence the 'action') The combat is physic driven, and based on realistic collisions instead of stats. The game has advanced AIs and fluid, yet skilful combat, and some truly great tech to back this up. However the pitch tells nothing about the story.
So the picture I get of SG from just watching the pitch, is that it'll feature some amazing combat experiences, with some great details to enhance the experience. To me, that's enough to get me hooked.
I always preferred challenging games with great combat systems over more story oriented games. (This is for instance why Demon's is my favourite game of all time) That's not to say I don't enjoy a good story. But the story is only exiting the first time you experience it, while a good combat system can last for thousands of hours.
Also, to be honest, I kind of like the "you're an unknown hero, there's an evil villain, you've to defeat him to save the world" storys seen in games like the Souls games, Super mario and Zelda.
Anyway, I can understand why some people get a bit sceptical after watching the pitch.
It shows some very interesting tech, but the general gamer isn't interested in that stuff, hence the pitch, would've been better as a dev video.
Does "feel" starting to sound strange to anyone
