I don't use Starbucks enough to have a serious opinion, but Bob Geldoff said that the problem was the cups- they have decent enough coffee, but they use difficult, flimsy paper cups.
If you disagree, blame Sir Bob.

But this cartoon says different...
http://www.albinoblacksheep.com/flash/sbux.php
You shouldn't be offended by this 'toon, but if you're easily offended, don't click it.