Angular is developed by Google and has several developer-celebrities evangelizing it on the web daily, speaking at conferences ever other week, etc. It would be shocking if Angular weren't the most popular framework.
Brilliant point; it's not just that the docs are poor, inherently the framework is so obscure that you need to either be an Angular savant or constantly Googling only to find half the inbuilt functionality cannot be made responsive!
Agree. What set apart a project from another is the quality and amount of documentation, also tutorials, articles, books and reviews(it help a lot on the popularity context).