Beyond the obviousness of how bad he is, I just did a little data crunching...
As a head coach, Gase is 24-33 (including the 1 playoff game). HOWEVER, in only 3 of the 24 wins did he win by 10+ (with 1 being against Bryce Petty lead Jets), with an average win margin of 6.7 pts... In 26 of his 33 losses, he's lost by 10+, with an incredible 11 of 33 being by 20+. His AVERAGE loss margin is 16.6 pts.
So yeah, when things go bad for Gase, they go REALLY bad.