Richard Sherman is tired of the criticism. The All-Pro cornerback negotiated his own contract with the San Francisco 49ers upon being released by the Seattle Seahawks earlier this offseason. The result was a three-year deal that’s heavy on incentives, causing many to wonder whether Sherman would have been better off hiring an agent. But as Sherman explained Tuesday, there was a method to his madness. And thus, he defended the contract, both at his introductory press conference and via a piece published on The Players’ Tribune. “It was really important to me,” Sherman told reporters Tuesday, per ESPN.com. “I think that a lot of times... NESN.com