This article was at the end of 2017 and Tomlin was one of the worst in 2015 to 2017
Worst challenge success rates among active head coaches, 2015-2017
1. Mike Tomlin, Pittsburgh Steelers: 3-12 (25.0%)
2. Bruce Arians, Arizona Cardinals: 6-20 (30.0%)
3. Mularkey: 4-13 (30.8%)
4. Chuck Pagano, Indianapolis Colts: 7-21 (33.3%)
5. Fox: 5-14 (35.7%)
.....
Main takeaways: The samples are small here, but the key is that Tomlin has really lost his groove. After going 24-for-44 (54.5%) during the first seven seasons of his head-coaching career, he’s just 5-for-18 (27.8%) the last four years. Also, Marrone is still awesome and Mularkey still sucks.
Best challengers in the NFL: Doug Marrone, Mike McCarthy, Ron Rivera, Kyle Shanahan, Jay Gruden
Worst challengers in the NFL: John Fox, Mike Mularkey, Mike Tomlin, Bill O’Brien, Jack Del Rio
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https://thecomeback.com/nfl/which-nf...allengers.html