Megson has stepped in on an interim basis this week.
Asked if there was a dearth of top bosses, the 58-year-old said: "Not at all. There's a lot of good managers not working, myself included.
"Once you've been a manager for a while people have preconceptions of you that in my case aren't particularly how I am.
"When clubs are looking around for a manager they must have an idea of the type of person they want.
"It used to be winning games, getting the job done, and moving the club forward.
"I've taken over clubs that in the main have been in a mess and managed to turn every one round apart from Nottingham Forest, I couldn't do that.
"But there's other things that people are looking at, pretty shallow things. Hey ho."