Washington Redskins Star -- BLASTS RGIII ... 'No One Believes In Him Anymore'

Robert Griffin III is a spoiled diva who cares more about branding himself than winning ... so says a Washington Redskins player who tells us he's not the only one in the locker room who feels this way.

The player -- who spoke with us on the condition of anonymity -- says playing with RG3 has been a nightmare this season ... and the locker room has lost faith in the QB.

"No one is happy ... no one gets the hype around him anymore."

As bad as Griffin's play on the field has been this year, our guy tells us it's actually RG3's off-the-field demeanor that ticks off his fellow players the most.

"He's secluded and it affects us in the game. We don't have that real rapport. He's lost confidence and is complacent now."

There's more ... Griffin's mediocre season has made some of his teammates skeptical of not just his future with the Redskins ... but in the league period.