My unpopular opinion on unpopular opinions is that they often aren't genuine opinions but an easy way of getting attention/ winding people up/ both. Or, at least, that's how a lot of them start and then confirmation bias kicks in and you start to notice only the little things that back up that point of view you decided to take in the first place and it then becomes fully ingrained.
Oh, and Roberto Mancini is a bang average manager who isn't capable of holding a job down for more than a couple of years because he's an egomaniac.