They were understaffed for a Sunday morning. There were 16 people in line and they only had one person at the register. This is the management's fault, though, not the employees' fault.
The (expensive! at least $1 above regular Starbucks prices) drinks came out fairly quickly after we ordered since there were two people making drinks. The layout and look of the store was nice, but there was trash on the ground and a bunch of crumbs on a few tables..which was not pleasant to see right before leaving Vegas. :(