data-mm-id=”_wyf1iljgo”>NFL head coaches typically don't give honest answers about their teams' performances until after they have had time to review the games.Las Vegas Raiders head coach Antonio Pierce did not need to watch tape to confirm what he saw from the sidelines during Sunday's shockingly awful 36-22 loss to the previously winless Carolina Panthers in the Silver and Black's home opener at Allegiant Stadium.RELATED: Jon Gruden wants a second chance coaching in college, but does he deserve it?In fact, Pierce witnessed enough of his players failing to play hard that he decided to mention the lack of effort during his postgame press conference. He made the damning observation after agreeing with a reporter's observation about the Raiders being no-shows ag…