Groomed Hasselbeck in his rookie year as QB coach (Together with Holmgren, obviously).
Groomed Aaron Rodgers together with his QB coach to the point he is at now.
Developped Rich Gannon who finally started standing out in Kansas City.
Worked with Steve Bono in his best statistical year in Kansas City.
Like you mentioned, Aaron Brooks. He had some very decent statistical years and had a horrible decline in 2005. The year after McCarthy left the Saints.
Anyway, he hasn't been given a whole lot of amazing QBs, but, from what I have seen, he has pushed all of them to their limits.
EDIT: A few of your points, I already reponded to.
Anyway, how much influence do you think a QB coach has over the entire team? You want to blame him for not winning a Super Bowl with the Chiefs or Saints for instance? Given, he was the offensive cordinator in New Orleans, but he had to do his thing wth Aaron Brooks. Like I said, groomed well and pushed to his limit, but not a great QB by any means.
How realistic is it anyway to say that he's a bad HC because he hasn't won a SB yet? Do you consider Jeff Fisher, Raheem Morris, Jack Del Rio etc. bad coaches, untill they win a Super Bowl?