I realize they were ranked so an eight seed would seem low, but looking at their resume it looked like they were overrated by the polls rather than underrated by the tournament committee.
Their six losses:
Michigan State, a 5 seed.
Wake Forest, a 9 seed.
Duke, a 1 seed, but they got absolutely destroyed in this game 76-41.
San Francisco, 12-18 in the West Coast Conference.
Loyola Marymount, 18-16.
And a thumping by St. Mary's, a 10 seed.
Their best win, by far, is over Wisconsin. Nothing else really jumps, in fact their only other win over a tournament team was over the aforementioned St. Mary's.
An 8-seed doesn't seem that ridiculous to me.