There's nothing wrong with any of the elements of that cover, but they don't come together to make a powerful whole. It's a lovely shot, but it's very vertical. The text is restrained, but doesn't sit easily in the space provided, it looks lost.
I do like the slightly misty background of the image itself, but I don't feel compelled to buy a magazine on account of a good look at the dew on someone's lawn. It's a wonderful editorial image, but not cover material. There's almost too much of a story in that shot, when most covers are one-dimensional attention-grabbers.
But in a way, it's also marvellous that it's happened. We need the occasional cover that doesn't play by the rules.