The rest of the world seems to think so.
Among the critiques are that it provides very few rights, that it's old and economically worded (e.g. doesn't do a very good job of explaining precisely what it's trying to say.) Add to that recent SCOTUS rulings that have drastically reinterpreted the document according to "original intent" and the general decline in American power and influence around the globe and you have a recipe for a dying document.
And with it, a dying nation.