Maybe my understanding is wrong, but closure (and closurescript) are compiled languages. Angular is a UI framework, so comparing them is apples to oranges.

And I think the Angular community would be thrilled if it had even close to the kind of documentation that Rails has. You are correct, no one framework will rule them all, but there are examples of OS projects that have good docs (like jQuery and Rails) that can be used as comparisons when evaluating a framework.