As everyone has mentioned, the stadium was very reverberant. I imagine the back curtain helped control the slapback echo, but they should have also done an acoustic ceiling as well. The Georgia Dome used to be the worst about echo until they put the fake ceiling up this year. The stadium sound wasn't so bad in the first section on the 40 yard line though.
One thing I did notice were the poor stadium electronics. There were many times were wireless mics were dead, and other times when audio from the intermission videos would be scratchy. For such a venue, I would imagine they would have much more professional audio than that.
Other than that, I don't like Indianapolis. There's not much to do in downtown save for the museums. There are also very few food/drink choices around the stadium. Basey's (across the street from the stadium) had extremely overpriced food and beer, and the waitstaff were astonishingly rude. Bloomington seemed to be a much better venue for finals, and I hope DCI will consider it again in future years.