I own a Dreamcast. I have to say that their sports games were second to none in their time.... They still are superior to PS2 and Xbox in design, but the Dreamcast is old hardware and can't compete with the graphics or speed or memory capacity of the newer systems.
The main reason that Sega discontinued the project is because they weren't selling enough in the U.S. because of everyone's PS2/Xbox/Gamecube anticipations. When all 3 of your competitors are offering better systems, it's hard to compete, but the Dreamcast was by far the best system on the market from the first day it came out until the PS2 came out.