Perhaps more than any other sport, a bad head coaching hire in the NFL can ruin a franchise for the better part of a decade. When you consider the free agent and draft acquisitions that are made to fit a coach’s style and philosophy, it’s no wonder that it usually takes years for a team to rebound after a bad coaching hire. As part of our ongoing Decade Debate series, here are the 10 worst head coaching hires of the past decade. To be clear, this ranking is based on the result of the hire, and not necessarily the hire itself. (Although the ranking could be a combination of the two.)

10. Eric Mangini, Cleveland Browns, 2009

One might argue that since Mangini hasn’t even gotten through his first year in Cleveland yet that he doesn’t deserve to be on this list. But others will argue that since he was absolutely despised in New York that the Browns should have never hired him in the first place. After all, was the one winning season he had with the Jets worth the Browns giving him a shot? Some of the moves that Mangini has made since arriving in Cleveland haven’t been bad at all: Trading Braylon Edwards and Kellen Winslow, trading down multiple times to acquire more picks in the draft, acquiring safety Abram Elam, etc. But considering he hasn’t won many players over with his crass attitude, has made two quarterback changes and only has one win under his belt, things couldn’t have gotten off to a worse start in Cleveland. It’ll be interesting to see if the Browns fire him after only one season.

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