People who bash Mangini dont seem to get that the guy was given a HC job way too early in his career. He served as DC for ONLY one year and was previously a secondary coach for 7 years. Thats about the extent of his experience.
Despite this lack of experience, he managed to turn a 4-12 team depleted of talent to a 10-6 playoff team in 1 year. He had winning seasons 2 out of 3 seasons with the Jets. That is pretty amazing for a guy with so little coaching experience.
With regards to Cleveland and why he did so badly there...did you see the talent he had to work with? He had nothing. And yet Cleveland still managed to stay competititive in most games. Its not surprising that alot of Browns fans were not happy when Mangini was fired and replaced by Schurmer. It seems Schurmer didnt fair much better