Its not as simple as you indicate. First, I saw this team play better in several of their qualifier games earlier this year and late last year but they also had different personnel at times. The real head scratcher is the exclusion of either Eddie Johnson or even Terrance Boyd as players that can either replace Altidore or play alongside him and let Dempsey play underneath them more.
According to FIFA rankings, the Americans are also ranked 13th. I'm not sure where many expected them to be but this is a nice place to be ranked, especially since earlier last year we were in the low 20's. What scares me about this team is that they decided to go young and inexperienced in hopes of gaining some experience for the next world cup rather than going proven players who may be 5-6 years older. This team has talent but we are lacking depth up front and we have some young guys we are having to lean on a bit so its a bit shaky. However, I think this team is likely better than what people thought they would be going in to this because most likely hadn't seen them do very well in qualifying.