I was just looking on FanGraphs at the top center fielder's by WAR over the past 3 years. I was shocked when I saw that Beltran wasn't on the list, as seen in the link above. I then realized he's been injured the past two season, so I clicked "all players," and there he is! The second best player at his position in the past 3 years without even playing enough games to qualify 2 full seasons.
But he sucks and was a huge waste of money.