polluting HTML with.. HTML attributes? Angular lets you stay very much in line with the spirit of HTML, which is a declarative language. To me, when done right, an angular infused HTML page reads very nicely. It's clear to the designer what elements do what. All that logic isn't hidden away in some javascript file.

The fact that you do very little DOM manipulation with angular.js is one of its biggest advantages, IMO. Makes it easier to write maintainable and testable code.