I don't like many front-end mvc frameworks. Why? Because they tell me what to do and how to do it. But, I do like backbone.
To me, backbone feels like a wise old man, who doesn't care what others think about it, and only has time to be concerned with the truly important things in life; You know, the simple and foundational things, like models and collections and views that don't do much at all without your intervention. This old man is far too wise to tell you how to use the tools he provides, and despite being bored with life's higher-order redundancies, he gets continual enjoyment out of watching how you use the tools.