He is a good player, don't get me wrong, and get him on a good day and he can be a match winner. But for a player who blows hot and cold, he hasn't brought that much sunshine to St James' Park since his transfer from Ipswich Town back in the days of Kenny Dalglish.
Some will argue his career has been (semi-)ruined by injury. Who can argue? But he has been a fool to himself with his crazy "flasher than flash" chav lifestyle. The diamond ear-rings; the Ferraris; living the dream to the full ... but more OFF the field than ON it.
His failing was not to respect the club that brought him his riches. And when he refused to play in a position for Sir Bobby Robson that he begged to play for England ... then threw down the Newcastle captain's armband ... that was it! He showed exactly what he thought of Newcastle United Football Club, and a man who was in his 70s and achieved 100 times more in the game than Dyer ever will.
Sam Allardyce yesterday admitted Dyer could leave - and I hope it is sooner rather than later.
The Day The Toon Army Turned Against 'Chav' Dyer
After more than a week of speculation over the 28-year-old England midfielder's future, Allardyce has confirmed that "family problems" mean he could end his eight-year stay on Tyneside.
Allardyce: "If it's not right for Newcastle United, Kieron Dyer will not be leaving. If it's right for us and right for him - it can't just be right for him and not for us.
"Those discussions will continue over the period of time it takes to come to the decision one way or the other.
"If everything falls into place for both, for us and for him, then that's fine; if it doesn't, then from my point of view, I have to protect the interests of Newcastle United.
"Kieron Dyer is a top player. I would like to resolve his problems - that's what every manager has to do.
"If it's not possible to do that while he is here at Newcastle because of the family problems he has got, it might have to be somewhere else.
"We will have to wait and see."