Shadow DOM is incredibly powerful. For the first time ever, we have proper encapsulation without the extra baggage of <iframe>s or other older techniques.
Shadow DOM is certainly complex beast, but it’s a beast worth adding to the web platform. Spend some time with it. Learn it. Ask questions.
I first got introduced to Shadow DOM at Fronteers ’11 (and blogged about it). Glad to see things are going somewhere (in Chrome at least)