Each year, the NFL Player’s Association surveys their members (the players) about the quality of each team. Players rate things like the owner, the facilities, how a team treats player’s families, the strength coaches, the training staff, the food and cafeteria and head coach.
“One of our core jobs as a union,” the NFLPA notes, “is to improve the overall working conditions for our players, which includes the daily experience of players at the team facilities away from the lights and cameras.”
But, do working conditions help a team, just win baby?
Not really. With a Pearson’s CORRELation of .192, rely on something else.
Here’s what it looks like as a chart. The Miami Dolphins had the highest rating and Chiefs had the lowest.

There are some shortcomings: change of coaches, change of players, etc. We also don’t know how many players submit the survey. However 1700 respondents out of about 2000 players is a great survey return rate.
Enjoy the game!