Many people are pointing at the fact that Carroll only has a .520 win percentage in the NFL as compared to his very impressive college career. This is a very weighted stat as in the NFL every week is against an elite team, while as in college, you will play 3-4 games a year that are against weak opponents. I argue that above 50% in the NFL is a very good record.
Then people will say he had a losing record in the playoffs. When he was the head coach of the Jets he only had one year and he was in arguably the toughest division in the league.
When he was with the Patriots in ‘97, he beat Dan Marino and the Dolphins in the playoffs, followed by losing by 1 point to the thriving Pittsburgh Steelers who lost to John Elway and the Broncos in the next round.
The next two years weren’t as successful, but he still didn’t have a losing season with the Patriots. He didn’t have any control over personnel while he was at New England, and this time it looks like he might have a lot more. Only time will tell if he can become a successful NFL head coach.