What works on navigation and ease of use: the top, bottom, and side headings. Really can't say what doesn't work, since it's pretty easy to understand.
Some of the images don't really "wow." Some of them are either someone posing (a little too much) or just not a very good shot of someone in the middle of a project. There are a couple that show cheerful students that work for a university website and I do like some of the rollover pics taken of activities and group of students. I don't know, I just feel something lacks.
The website could probably use some more pictures of nature found within the campus. More organic colors to display and add a homey or comfortable and relaxing type of feel. I noticed that on some of the websites; that they found a bit of pride in their state. So maybe for this school, what's appealing to this part of southern Indiana. Also, maybe some pics of classes in session with teachers lecturing. And what it could use less of is the school colors as background. I think it should be prominent where the context is, simplifying the back overall.
I think prospective students looking for a university would want to find out more about the academics, location, school happenings (in order to get an idea about the school), and maybe some pics of the campus and what it's like around the area. I agree with those expectations and I think the website should look more academic, while maintaining a few degrees of commercial entertainment in order to show prospective students how great the school is.
Boston University and the University of Texas-Austin stand out as a couple of good websites. There are thousands of university websites and the few I perused and these two were found to be more...simple and attractive. After navigating through a few pages, there was nice flow and the pictures were better compositely. They did have some links that told about their city. While Boston University has at least one pic on each of its pages, the University of Texas- Austin has a few with no pages, but it doesn't lack in presenting its information in a clean and concise manner.
I think USI could look to these websites as an idea to lean towards, while probably looking at some art and computer graphic schools to also integrate into their website. But overall, USI's website does well for the purpose it was made for.