SI polled 354 players. Players were not allowed to vote for their own coach.
Best coach was Belichik (Gibbs didn't make the list):
Who is the worst coach in the NFL?
Tom Coughlin ................... 29%
Marty Schottenheimer .. 14%
Butch Davis .................... 11%
Dave Wannstedt ............ 11%
Mike Tice .......................... 8%
Bill Parcells ...................... 6%
Dennis Erickson .............. 4%
Jon Gruden ...................... 3%
Dennis Green ................... 3%
Jim Mora. ...........................2%
http://sportsillustrated.cnn.com/200.../players.poll/