The two players are not similar at all. Cameron was an excellent centerfielder who hit for power, struck out alot and stole some bases -20 to 30. Bourn is a very good centerfielder, who steals bases - 50+ - and hits alot of extra base hits and strikes out alot. Bourn is a lead off hitter and Cameron was a #6 type hitter.
Bourn is not a superstar. That's why he's still out there. He is a major upgrade to the Mets lineup if Alex is right. He upgrades the top of the lineup and solidifies the CF defense in cavernous Citifield.