Pros
Free Coffee! Free Tea! Free Drinks! For younger people in the lower rung of retail barista, there is decent support with helping you advance yourself as an employee. If you manager is half-way competent and there is room in your district, you can quickly get Learning Coach (Trainer) Training and eventually become a shift supervisor. There is moderate room for personal growth at Starbucks, though less actual positions for Assistant Store Managers across the board right now, simply because the company is trying to cut down on store openings. You get to meet new people everyday and forge really interesting relationships within your community. The health and vacation benefits are still pretty decent and not too hard to "earn".
Cons
Long shifts and clueless customers often make for grumpy Baristas. The dress code isn't universally enforced, which leaves hard feelings in areas where it is strictly enforced. The company seems to be in a transitional period, trying to redefine its identity in this time of economic hardship and one-stop shopping. Heated sandwiches, banana-protein shakes, and frou frou drinks with a billion different steps and make-ahead preps seems like we're trying too hard to please everyone, in what used to be a niche, status-symbol market that actually focused on coffee. Customers seem more self-centered at Starbucks than any other place I've ever worked. It's one thing to not want pickles and cheese on your Whopper, but people get insanely complex with what should be a relatively simple beverage. Take a grande mocha which is made with chocolate sauce, 2 espresso shots, steamed milk, and a bit of whipped cream: there are customers who have no qualms about asking for 1/2 espresso shot, half-dark chocolate, half-white chocolate, steamed breve (half-and-half), no whip, at 200 degrees (nearly boiling) mocha, all while complaining that they are in a rush and you should make their drink before the other five you have lined up before theirs. You have to be willing to not take things personally and to check your attitude and beliefs about common courtesy at the door. People who can be cheerful in the face of adversity will do well.