It's funny, I was about to write a blog about the same thing, but you said it perfectly.
And I'm a fan of Darabont too, but when I read the script, it wasn't this grand script everyone was speaking about. To me, it was just there and if they had any sense, they could've waited another year. But like you said, it's about to make 600 million worldwide, so they did something right.
Good job. Also loved your Marx Bros. review/retrospectives. So much so that I finally plunked down the money to get the box sets.