As an Eagles fan who follows them 24/7, here's my response to that:
I wouldn't put too much into Matthews' drops. It was his first NFL action in his life. Sammy Warkins had no cathes in his first game and nobody is calling him a bust. The drops were bad, but this kid has tremendous work ethic. He'll make the necessary adjustment. I wouldn't worry about it.
McCoy had one carry all game. They were taking it easy with him. To say he's declining because of that is a little ridiculous. It can also explain why the first team offense wasn't too sharp, because the Eagles offense revolves around McCoy and the zone read, which I didn't see them run at all last night.
The offense should be fine and I'm sure they will be one of the top 5 in the league this year. The defense worries me, but they looked a little improved and I like what I'm seeing from the younger guys.
How can a culture of losing be developing after a 10-6 season and one preseason game?
All in all, it was just one preseason game, and there's not a lot you can conclude based off it. Wait until regular season rolls around.