You eliminate the Xbox which launched Halo, Forza - the industry leaders in their genres to this day, the groundwork for the best controller in the industry, the console that perfected online gaming we know of today, and eliminated silly memory cards? Yet you keep consoles you've never touched and know little about, and consoles that killed the company's hardware future? Huh?
Flawed thread is flawed. The Xbox deserves to be in the top 5 - at least. Today's consoles would be much different beasts had the Xbox not have existed. That makes it 'important' to say the least.