elrey The getreading,co.uk has Veljko Paunovic coming in. He's got a 31% win ratio with Chicago Fire. He had one good season, finishing 3rd in the Eastern Conference (some silly thing where they split the league for seemingly no reason, when they all played each other anyway)
Seems after that he just got worse and worse.
You can look at his record in a couple of way - yep losing 44 of 100 games doesn't read well but in the 3 seasons prior to him joining Chicago had finished 12th, 16th and then last.
In his first year there, they finished last again but then the following year he took them to 3rd and their play-offs for the first time in 5 years before they reverted to type the following year - mainly due to draws (18 of 36 games drawn). In his final year they missed the playoffs by 1 win. So overall, he did improve the club quite markedly from where he joined them.