It had an atrocious reveal event focusing not on games but on multimedia functions.
It had forced Kinect inclusion bringing the price up to a level nobody wanted despite it being the marginally weaker console.
They had horrible plans for DRM, so bad that even when they rolled them back it still hurt their image.
The Xbox 360's latter years were pretty barren for exclusives, leading the console to slow down and the PS3 to eclipse it, thus altering momentum on both sides
The launch games sucked.
The subsequent exclusive games were mediocre or disappointing
There were virtually no new IPs and many of the games being developed for the system were shelved
They made it so that all games were on PC as well
They continued to not release any games, focusing more on sheer power for the Xbox One X. Power and Backwards compatibility in the later stages
Ps4 was an absolute beast of a console, hitting all the right notes and punching Microsoft when it was down.
So, basically, Xbox failed in virtually every way that matters while the Ps4 learned from the Ps3's mistakes and delivered in price, performance, and platform exclusives without requiring any of the chaff and side garbage nobody cared about, like Kinect.
My Console Library:
PS5, Switch, XSX
PS4, PS3, PS2, PS1, WiiU, Wii, GCN, N64 SNES, XBO, 360
3DS, DS, GBA, Vita, PSP, Android
