In a recent interview with questions submitted by users, Starbucks CEO Howard Schultz was asked what he dislikes at Starbucks. He responded the he doesn't "like any of the drinks that have been pre-sweetened, in terms of frappuccino and things like that," and that he's "a purist when it comes to coffee."
Just say it like it is, Howie. You don't drink Frappuccinos (Frappuiccini?) because they TASTE LIKE SHIT. Their caramel flavor is bearable, but I'd still be hard-pressed to finish a small. They're bitter, with a tangy, artificial sweetness to them. Nothing about them tastes high-quality or gourmet. I would expect a similar beverage from Dunkin' Donuts.
In general, I think that Starbucks' offerings are very high-quality. Frappuccini is not one of those offerings.