PS+ gives you a feature to try a number of games for up to an hour. A fine feature for games I am unsure about. For something like Metal Gear Solid, I do not need a demo since I am comfortable with the formula, and I am sure I'll be comfortable with whatever deviations Hideo Kojima implements in future titles. But there are the "?" games that come out every now and again. In those cases demos are good for me since I do not always agree with reviewers.
They would have to make the demo a proper representation of the game though. I've played horrid demos only to shun the full game, and after playing the game later I realized the demo was a poor reflection. The first inFAMOUS game had a fantastic demo. It gave me a great idea of what to expect.
Playstation = The Beast from the East
Sony + Nintendo = WIN! PS3 + PSV + PS4 + Wii U + 3DS
