the xbox actually had decent third party from what I can remember and wiki backs that memory up.
"Although the console gained strong third party support from its inception, many early Xbox games did not fully use its powerful hardware, with few additional features or graphical improvements to distinguish them from the PS2 version, thus negating one of the Xbox's main selling points"
The 360 success is due to A. beating the competitor to the market. and B. being cheaper than its closest competitor and







