Here's what makes a great barista (according to one customer)
"The 'great' baristas are the ones that are skilled at noticing customer patterns or remembering your face," says a Starbucks regular. "If they see you more than a few times, they'll eventually introduce themselves to you and ask your name. They are skilled at engaging people in a friendly demeanor. If they see you ordering the same drink over and over again, they'll eventually memorize it."
I would say that a lot of baristas at the SBUX stores I visit fall into the "great" category by those standards.