I just love it when some of you use sales as a talking point.
Xbox 360 wasn't selling all that great, even in 2007 when it had a shitload of exclusives like Mass Effect, BioShock, Halo 3 and more. it didn't really take off until the cheap Slim and Kinect in 2010.
Not to mention, the XBOX wasn't a strong brand when the 360 launched, unlike the X1 that benefited from a strong fan-base that the 360 built. If we are talking numbers, the X1 is disappointing no matter how you spin it, for the following one simple reason: it could've done much better.
2017 is the equivalent for 2010 for Xbox360, this year Xbone will fall behind badly and will remain there forever.