oh, I wouldn't know where to start...
you got their waitlist letter, so you know at least a part of it yourself. Also, why do they even bother calling up people for the interviews if their decisions are already pre-set. As much as I don't like the school, I loved my interview there; the guy was a real pleasure to talk to (probably the first time I could say that at an interview). Obviously the interview outcome had no bearing on their decision.
Anyhow...I'm not gonna rant, although I have lots of reasons to be bitter about that school. That doesn't help anyone here. Instead, if you have specific questions about the school, I'll try to address them. I'm unfortunately more familiar with it than I would've liked to be. 😛