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You might want to check your math before you proclaim the superiority of the NL West.
The NL West is an aggregate 10 games over .500. The AL East is 23 games over .500; the AL Central, despite the pathetic Royals, is 32 games over .500. The NL West has an aggregate .511 winning percentage; the AL East has an aggregate .526 winning percentage; the AL Central has a .536 aggregate winning percentage. In interleague play, even playing against the "weak" AL West, the NL West was under .500.
If you look at their record against other divisions in their league, the NL West is two games under .500 against the NL East, so it's hard to claim they're stronger. Their aggregate winning percentage is based almost entirely on beating up on the NL Central, so all their record really proves is that they're a lot better that the worst division in baseball.