I though Barrett did ok at Manly with the squad he had. The Trabojvic brothers seem to love him and he only got screwed over by DCE when he defended him against Jackson Hastings then DCE threw Baz under the bus. Baz should not have trusted his capt I suppose. Jackson was acting like a tool apparently anyway like he has done at other clubs he has been too and Baz just had no time for it in the end.
Gus also had huge wraps on him and was gutted he left Panthers as he did a fantastic jib with those guys only for Griffin to screw them over with his dull style of footy.
I had a look at Barretts time over at Manly and its quite baffling. He had the same squad if not better than what Des had and less injuries. Both Trbojevics had already made origin too. No major changes other than losing Shaun Lane who was apparently one of their best players and try scorers.
On paper they are similar to us, decent enough roster, rep forwards, rep half. But Des has them clicking for some reason. Mary is the issue for us and I dont think Barrett will be any better.
As for your comment about Anthony Griffin, I cant exactly agree either.
You just have to look at the stats! He took them to the top 8 first two years. In his final year he was sacked while on 65% win percentage and arguably if he kept going they would have finished higher. And this is considering all the background BS that would have been going on.
In conclusion both Barrett and Griffin aren't top tier coaches.