I've always suspected this. I think it's why the offense is so boom or bust (though lately it's only bust). But I think it helps explain all the QB-WR miscommunication and the disarray we see.
Just look at Washington's offense... There were some very creative plays out there yesterday that were run effectively even with a rookie QB, rookie RB, and a rookie WR like Robinson. And Rob Ryan was throwing different looks at them, too. But they still were far more efficient than our offense.
Jason Garrett offense rank minus Tony Sparano: 18, 14, 7, 15, 15