I have had tickets in 13a... and the student tickets between 2001-2003.
That being said, I've sat in C deck before as well.
My opinion would be, if you are a casual fan that doesnt know what to watch w/ respect to plays developing, etc and you're there for the excitement then sit in A deck somewhere close to one of the student sections.
If you're there to watch the game and see how things develop as they develop, analyzing the plays, the D, etc... Sit in C