People who actually do this for a living think you're wrong, so I'll go with them. These guys are good at their jobs, but that doesn't mean they're perfect or could truly know the depth of a system. In 2012 the Rangers ranked as Baseball America's 2nd best farm system. Their top 5 prospects were listed as Jurickson Profar, Martín Pérez, Mike Olt, Leonys Martín, and Neil Ramirez. Also in 2012 the Marlins ranked as Baseball America's 28th farm system. Their top 5 prospects were listed as Christian Yelich, Marcell Ozuna, Jose Fernandez, Matt Dominguez, and JT Realmuto. I went to 3 different sites for 2012 and the LOWEST rating for the Marlins was #13. The highest was #10. I can't believe any credible site had the Marlins the 3rd WORST farm in 2012.