17. Dennis Erickson
Sometimes your players are so good that it makes you look like a better coach than you actually are. That was exactly the case for Erickson who managed four mediocre seasons with the Seahawks before two shambolic years with the 49ers. The best thing he achieved was posting three 8-8 seasons in Seattle.

However, with the quality of players he had like Cortez Kennedy, Sam Adams, and Joey Galloway, they should have got into the playoffs at least once. Finally, after treading water the Seahawks fired him to bring in Mike Holmgren. Erickson totally flopped when he resurfaced in San Francisco.