I was there in July, 2002 when I got stuck on a Friday night due to bad weather. No "distressed passenger" rate- while I was waiting in line at the CO counter behind a whole lot of other people who were being told, "sorry, we're not paying for your hotel" I just got on my cell phone and called Hilton- rate was around $120.
Hard to compare it to others for a quick overnight- after sitting out on the runway for 2 hours and being brought back to the gate, I think I would have been happy with anything. Room service was prompt (I was starving).
Either they've raised their prices a lot since then or I got very lucky.