I don't look at this as a Metal Gear game. It's just a Platinum Games game to me. If you're not into Platinum Games, then there's no reason to be into this. This really doesn't look like it was made for Metal Gear fans anyway. Metal Gear seems like it's more about story than gameplay and Platinum's the opposite.
That video is awesome, by the way. I hadn't actually looked at any unedited gameplay footage before. I also didn't know that's what Raiden sounded like. I thought he'd be less gruff.