When going to interviews you have to be able to look through the "salesman" aspect of some of the schools. I had some schools espouse about they were ranked "#-whatever" of all the dental schools, but when I asked how they got that rating, they said it was based on research funding. I asked how they were ranked on their clinical skills, and I got a weak response.
I also have had schools tell me their patient pool was a certain size, but as I talked to the students, I enjoyed hearing how some of them had such a large patient pool to pull from that they finished their senior requirements by December of their 4th year! I also interviewed at some schools in areas where the students were worried about getting enough patients so they could graduate on time!
I also think performance on Part I of the boards is most important b/c that is the only board score you will have when applying for specialty programs. Schools who said that their students didn't do that well on Part I BUT do much very well on Part II didn't resonate with me.
Lastly, some schools will tell you that they graduate 100% of their students in 4 years. If 75 students enter, then 75 will graduate. It sounds good, but you have to be worried that they might be pushing kids out as quickly as they are getting them in. I really liked the schools that said that you couldn't matriculate into the next year/semester without passing all sections of Part I.
Of course, that is what I was looking for in a dental school. I still maintain that there isn't a "bad" dental school. Where one school excels in academics, another might excel in patient availability/clinical exposure. It is up to you to decide what is important for you...