Tomlin is usually ranked top 10 by sportswriters, etc. Not that I put much stock in what they say but it is a far cry from "among the worst."
NFL.com-Tomlin 6 http://www.nfl.com/news/story/0ap100...coach-rankings
TSN (2012)-Tomlin 4 http://aol.sportingnews.com/nfl/stor...hy-mike-tomlin
I think both rank Tomlin too high but it seems unlikely that they are THAT far off and you are correct.