Although I'm not very familiar with the Metal Gear Solid series, I love quality stealth action games. And this is perhaps one of the best stealth games I've played! One mission (if we count only the "GROUND ZEROES" mission, NOT counting ANOTHER 5-7 side missions at different times of the day and tasks that are not similar to one another), one location, not much? But this ONE mission can be completed on two difficulties, in several ways: in one go, without killing, without stunning or using a tranquilizer, etc.
Plus, at least a dozen different types of weapons are hidden in this location. Plus the game has good optimization, with such cinematic graphics the game is not too demanding and even my rather weak laptop can play this game well. (Of course there is no 30 fps, somewhere around 15-20 (for some this may seem uncomfortable, but for me personally it is quite comfortable)). I'm really looking forward to The Phantom Pain! And yes, this demo is probably worth the money!