To the point about who have we played, I think it's a situation where most teams you play this early in the season will not be the same team that they are at the end of the season. I mean, really, we're only 3 weeks into the season. Right now all we have is speculation and hyperbole.
That being said, San Jose St. and Duke aren't world beaters, and perhaps Penn St. isn't as strong as their pre-season ranking may have shown. But, to be fair, beating Tennessee Tech, La. Monroe, and a UGA team without its best player (50% of its offense) is really nothing to pound your chest TOO hard about.
So if Arkansas is as good as advertised, then this should be the first true test for both teams.