True Pomona is kinda sketchy, but most of my classmates including myself only have to live 10- 15 mins away from school. Not a bad commute at all, since I used to have to drive a lot further when I worked out of school. 10mins to Claremont, or Chino Hills and both of these areas are pretty nice.
Sharing classes isn't really that bad. Do you really want to JUST know your fellow dental-classmates, or would you like to see who else is out there. You are going to have a tough curriculum in the science classes no matter who you take it with. ( Although I do believe the school will eventually have dental faculty for every class in the future.)
I'm not going to lie, business casual does get a bit annoying on a day to day basis. But overall, it really isn't that bad. The dental school sets the bar for dress attire, and it does feel nice presenting yourself in a professional manner.
I like where you are going with this, but in all honesty these are not the most important criteria when selecting a d-school. (Price, faculty- student ration, Board pass rate, how early do you start working with a handpiece, and how well do you think the school will prepare you to be the best you can be.) Those are all good questions to think about as well. The main reason I love this school is because of the FACULTY. We have some of the smartest and brightest from all-over the country and it is great working/learning from these good instructors.