Bottom line: Dreamcast has the goods, and it has it now.  Numbers of  polygons, vertex-lighted trianges, NURBS-aside... the system shells out  some incredibly smooth and beautiful graphics, and nearly every game takes  advantage of the system's power.  Take some genre-busting games like Soul  Calibur and Sonic Adventure (perhaps, the most fastest rollercoaster-like  3D platformer in existence) and you have one heck of a system.  The games  often revolutionize the curve (like Jet Grind Radio).