I appreciate your frustrations DH. Just a few points to note.
Very few criticised DCE prior to 2015. He won awards, was a rep player and assisted Manly to reach a couple of GFs. But then he had a top side around him. He didn't need to take on so much responsibility as he has had to over the past decade. Makes a big difference when you are the only top tier player regularly on the field. The only other one is Turbo but in many of those years he barely played half a season because of injuries. Manly have not had a consistent and capable five eighth during that time, so the responsibilities of the organizer and play maker, kicker, close in defender has all fallen on him. No one would criticise his efforts in 2021 when Turbo was fully fit and there was that Foran/Schuster combination creating huge space for the outside backs, or 2017 when Manly had Blake Green. Not surprisingly Manly made two of the rare appearances in the finals those years. DCE stared partly because he didn't have to take on so much.
The only other comparable half we've had was Toovey, and he was top class. But he also had a top side around him for much of his career. Makes a difference. And as for criticism, I recall probably our best five eighth Cliff Lyons, copped a heap from several quarters when Manly weren't performing well. It happens.
I actually rate DCE and Toovey at the same level as the two best we've ever had. However even Thurston, who I had highly, had his less effective years, and if you check they were when he didn't have a strong side around him