Your everyday average Starbucks. But with a longer line. At 150% of the normal price. Viva Las Vegas... but hey, if you're thirsty, you're thirsty.
If you're looking for good coffee, walk across the street to Sambalatte in front of the Monte Carlo. Prices are about the same and their espresso is much much better. They also have a nice outside seating area to relax and people watch.