I'm not sure about the majority of players but there have been at least a few players that have been outspoken in their criticism of Belichick for one reason or another (Brady, Welker, Amendola, Law, Ted Johnson, Adalius Thomas, Brandon Spikes).
A lot of Brady's former teammates are on record as rooting for him to win this Super Bowl. And anyone being honest knows Belichick is squirming in his seat with every accomplishment Brady has in Tampa Bay.
You may not want to acknowledge it or engage in the discussion but one of the most discussed debates in the sports world currently is Brady v Belichick. Hardly anyone is genuinely 50/50 and there's nothing wrong with that. For the most it's the Belichick side that wants to diminish the debate because they know they're getting killed right now. You can look up Belichick's record without Brady, it's not good, that's a fact.