To clarify, as youve not understood the joke, nor read the comments. As far as I understand it, were you to start sailing at the first point, you never have to turn to arrive at the second. That's why it's "straight". On the 2d plane you are completely correct however.
For proper and better informed explanations read the other comments :D
It is. From my experience a couple months back its crisp. Not the highest graphics, and it took a little getting used to from a high-end PC, but it was really nice. In certain aspects even preferable xD