Part of why they are considered differently is that the Japanese market ignored the Xbox and has continued to more or less. If you look at just the U.S market,

Part of why they are considered differently is that the Japanese market ignored the Xbox and has continued to more or less. If you look at just the U.S market, the Xbox was very competitive in the first generation. Halo in particular was huge in the U.S., and completely changed gaming and the first-person market forever.