No. Not at all. He's proven that he's far from rubbish repeatedly. Like him or not. He's an objectively good manager. That doesn't mean that a club with unlimited funds that could have any manager they wanted (other then a handful of well settled managers who already have it made) would even look twice at him.
I think that's based more on a kind of prejudice more than cold logic though. I don't think the people who run these clubs have much more of a clue about an exact recipe for success than the rest of us plonkers. The irony in man united fans moaning about the glazers and the united board is that their lack of recent success is in large part due to the management
listening to them and giving in to popular demand all the time, changing big-name managers every ten seconds hiring Ole after a winning streak and bringing back a 36 old Ronaldo!
I think by swapping Carlo for RB we've inadvertently ended up with the better manager albeit not the bigger name on paper.