I really think the coffee here is gross. At least the drip brew coffee, the espresso drinks are fine. Coffee is pretty personal, and I know a lot of people like diedrich's.
I find this place sort of obnoxious because it's always filled with people who sit for hours. If you're a lucky person who gets a seat, then this is a great spot. good for you.
They do have ice cream drinks too, which is a refreshing change from frappucino, ice blended, blah blah types of drinks.