I think this article sums it all up. According to this author, there is no team worse at trading than the NY Mets. He even provides statistical evidence, and of course references some of the classics...

Nolan Ryan and others for Jim Fregosi...
Amos Otis for Joey Foy...
Jeff Kent and Vizcaino for Baerga...
Singleton, Foli and Jorgansen for Staub.

He goes on to graph the teams from best to worst, and the Mets are so far below the statistical average, they don't even appear on the graph.

http://www.hardballtimes.com/main/ar...-of-the-trade/

Enjoy!!