How does the xbox 360 have better game libary then PS3?

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According to the reviewed games at metacritc,
96% of PS3 games score 70% or higher, 78% of 360 games score 70% or higher
34% of PS3 games score 80% or higher, 25% of 360 games score 80% or higher
2% of PS3 games score 90% or higher, 3% of 360 games score 90% or higher