The first Xbox was the console that got me into gaming, great titles like Jet Set Radio Future, Panzer Dragoon Orta, Halo and Halo 2, and a slew of others were just AMAZING. Plus the console was just magic, from the futuristic intro to the industrial theme, it was just the best console of it's time tbh.
Xbox 360 was equally as magical, it was the first to the market, it launched with strong games including my favorite, Perfect Dark Zero. It also introduced the Kinect which at the time was unheard of and phenomenal. It also had Halo 3 which was the game of the gen. Let's also add in Gears of Wars birth. Best console of last gen hands down.
Xbox One is still easily the best this gen, it had the strongest launch lineup and continues to impress. It's definitely more of a labor of love as it gets better with time, but overall it's in 3rd. But certainly not bad in any sense.