I don't actually live in the Mission, but I will tell you why I love hanging in the Mission.
There, I said it! In the Mission, you can find all kinds of authentic options ranging in prices. I would highly recommend reading up on "The Best of..." lists, you'll find that the majority of great SF eats are in the Mission. http://www.7x7.com/eat-drink
Hope this helps, enjoy!
Ali, Community Manager
PS My fave restaurant in SF is called Flour + Water in the Mission...mmmm....