I've flown through MSN a few times, and each time I've had some of the better experiences one can expect as a traveler.
The airport is immaculate, the staff are pretty friendly compared to most other airports (they will at least take the time to smile back), and the security isn't too rough or so I've experienced.
This airport is mainly used as a puddle jumper source, which is probably why the staff are more friendlier and everything is nicer, but still--it's a great experience before you may have to go through a more rigid airport like O'Hare or Minneapolis.