In the beginning I found a number of open and interesting questions (occasionally some of these were closed as being too opinion-based or broad, which bugged me a bit as they were some of the most interesting and illuminating (granted, you could argue that that is not the intention of SO. Still, having an interesting conversation closed seemed, at the very least, excessively pedantic).
The larger issue, I think, is that most open questions now are either of the "How do I do obscure thing X in framework Y under rare condition Z" variety, or beginner "Please do my homework" or "I have a bunch of things in my array it's not printing" sorts of questions.
Not sure what the right answer is for this. And, even so, I often get good responses when I post.