[AnIdiotOnTheNet]

True, but what's great about it is that it is such a simple method to achieve something that seems 3D. It's very easy to explain, the math is straight-forward, and it hardly takes any code, making it a great starting point for people interested in this sort of thing. Its simplicity makes it easy to extend the functionality too. For instance, you can add Y-shearing pretty trivially and get a limited range of motion on the view's vertical axis, or add floor and ceiling casting to get textures there, a little more manipulation can add jumping and crouching, etc.