The Marlins have made 0 playoff appearances since the trade- the Red Sox got players that sparked them to a World Series.
Yes, the Marlins have done well with the players they got, but they have yet to play in the postseason with Hanley/Johnson/Stanton.
The Red Sox were a playoff teams already when they got Becket and Lowell... the Marlins were where no where near that when they got Hanley.