Off the top (http://en.wikipedia.org/wiki/Television_producer) of my head:
*Fred Freiberger (http://en.wikipedia.org/wiki/Fred_Freiberger), if only for his reputation as being a "show killer" (http://www.republibot.com/content/%E2%80%9C-series-killer%E2%80%9D-can-we-all-please-stop-calling-fred-freiberger-now)

*Brenda Hampton (http://thebitterscriptreader.blogspot.com/2011/01/tuesday-talkback-what-hell-is-brenda.html) (7th Heaven and The Secret Life of the American Teenager (http://secretopinion.wordpress.com/2010/03/11/i-cant-watch-it-anymore/))

*Miller-Boyett Productions - Their shows arguably haven't aged very well and were when you get right down to it, quite often cheesy (http://zvbxrpl.blogspot.com/2009/03/was-this-worst-show-of-90s.html) and cliched

*Chuck Lorre (http://www.sitcomsonline.com/boards/showthread.php?t=298868)

Chuck Lorre and Brenda Hampton are everything that's wrong with their particular genres of TV.

HOWEVER, 7th Heaven makes for a pretty fantastic comedy.