What evidence do you have to say that the rest of those guys out coach Casey though? They all have more talent on their teams, and I can almost guarantee you that if you go to message boards for each of those teams, you'll find fans bemoaning allegedly boneheaded moves.
GSW got away from what worked in game 2, where they barely used the Curry/Lee pick and roll.
Certainly those excuses are pretty valid, and just as good as anything you can provide as counters. AND I'm not providing those as be all end all statements. I'm just saying, those guys all have holes in their styles too, and the fact that you're placing them firmly above Casey makes me think you may be a little subjective in your rankings. I'd certainly put them on the same tier as our guy.
I'm guessing you're providing your opinions on them based mostly on media depictions, which is fine. But you aren't giving that benefit to Casey. You aren't comparing them on equal playing fields (maybe).
Seriously, I think a lot of the dislike of Casey stems from 2 things:
1. We don't have all the information. This leads to us believing that moves he makes are unjustified, or flat out stupid, when that very well could be the furthest thing from the truth.
2. We watch every single game. Every time we see a supposed bad move, we think, man, isn't that ridiculous. But I have a hard time believing that if you watched every OKC game you wouldn't be pulling your hair out over Perkins' playing time (he's worse than Salmons AND gets more minutes!), as well as many other things.