There is nothing amazing about the One first year sales in comparison to the 360 other than maybe supply. Their sales are product of different circumstances. Who knows what the 360 would have been if there 3 million available units at launch and MS was willing to incur the level of bundling and price dropping the One saw in its first 18 months. The 360 didn't have a price drop for like two years.
Bringing in supply constraint is a bit disingenuous. Yes, the X360 was supply constrained in it's first 3 months. It was, however, oversupplied quite often after that, expecially for the following holiday season.
Yet despite ample supply of the X360 after the first few launch months, the XBO is still quite handily outselling it. More supply in those first 3 months would have only shifted sales to those first 3 months from the following months. It wasn't like the X360 had a competitor at the time to which it would lose sales. Anyone waiting for a PS3 after those initial 3 months was likely going to be waiting for a PS3 during those initial 3 months.
There also wasn't really anything on the order of Gears of War in order to boost interest in the XBO compared to the X360. Titanfall? Not even close to the interest that Gears generated. Ryse? Not really. Sunset Overdrive? nope. Dead Rising 3? X360 had Dead Rising.
In isolation there is no question the XBO is doing well. However, it isn't operating in isolation. It's primary competitor is doing signficantly better. And more to the point it's competitor is significantly outpacing how well almost anyone would have expected. It is performing at levels significantly higher than expectation. The XBO, if anything is performing slightly lower than expectations. Yet despite that it is continuing to grow the brand relative to the previous generation. It's not failing as much as it isn't performing as well relative to the competition.
PS3 can be considered a failure because it performed significantly worse than the previous generation. The same goes for the Wii-U which is underperforming by any metric used, especially when compared to the previous generation. It's hard to take the doom and gloom of claims that the XBO is a failure, seriously, when it is still outperforming the previous generation.
There's a chance that once we get to the point where we compare Halo 3's impact versus Halo 5's impact, that we can start to see some cracks leading to an eventual failure compared to last gen., but that hasn't happened yet. And to claim that it has is massively premature.
Regards,
SB