Philbin did do a good job. He may not have been in charge of the offensive game plan, or play calling, but his job was to insure that all the offensive coaches and players, were on the same page with all the play options, and actions. Demeaning that isn't really fair, because he was instrumental in making Rodgers a better QB.
Philbin just plain isn't a HC type. He's a nuts and bolts type coach. I always looked at him as being more of a choreographer of plays, and not the guy who wrote them up.
If you're looking for a "totally in-charge OC," he's definitely not your guy, but if you're looking for someone who can take your vision, and basic design, and turn it into something that works, he's right in the mix with the best.
Despite what anyone thinks, the HC, on almost all teams, either concentrates his efforts on the offense or defense, and allows more latitude to coaches on the opposite side of the ball, on his team. McCarthy is an offensive guy, and therefore much more in tune with the offense, and involved.
I believe that part of the reason the Capers defense failed was because he put Whitt in a rather strange position, since Whitt worked for Capers, but was still Assistant Head Coach. So... who did Capers report to? McCarthy, or the guy over him, who actually worked for him? It was a situation that should have never happened, and was just plain stupid!