It's not just the results with McGhee it's the fact that he seems to have lost plot and is constantly in stupid disputes with fans, officials and rival coaches. When he started drivelling about the Liverpool job, consulting a lawyer about being sent to the stand or something like needlessly talking about Rangers maybe making the top six it suggests (putting it kindly) that he has lost a sense of perspective.
There are also questions about his commitment to the club and his ability to bring in the players we need in the Summer.