Albert Pujols won the NL Triple Crown for the decade
From 2000-2009, no player in the National League was as good or as consistent as Pujols. It's no surprise that he led the league in HR and RBI, but for a guy with his power to lead the NL in batting average over the decade, that's ridiculous. He was also #1 in pretty much every other major hitting category, out of anyone with 5000+ at bats.
Best player ever? He might be, when it's all said and done.