Agree with what Teflon is saying, this game never pretended to be Metal Gear Solid, it is Metal Gear Rising. I look at it the same way as Final Fantasy, there are loads of main games, which are RPGs, and there are loads of spin offs that branch into other genres, that are not RPGs, or even Advent Children, which was a film, not even a game.
This is the same thing, Metal Gear is a franchise, and I think for a franchise to continue to be successful you need to innovate the style of the material, and theres nothing wrong with a bit of diversity.
That being said however, I haven't played the demo. Its made by Platinum Games, arguably one of the best developers in the world. They were the best developers to come from Capcom Japan, and they created the greatest action game to date, Bayonetta. I have no doubt the action in this game will be electrifying, but the level of storytelling in this Metal Gear game looks pretty bad.
