Hi Poly_cube,
I'm currently enrolled in the Certificate Program at Gnomon, and I might be able to help you out with your questions...
I can start by saying that the school, and particularly the instructors, blew away my expectations. First of all, the instructors are experts in their respective fields, and have the credentials to prove it. I began the program a mere 6 weeks ago, but in that time, I've already surpassed what I learned in over a year's worth of doing 3d as a serious hobby.
As for things I don't like about the campus? The only thing I can honestly say, is that the bathrooms are a total pain to get to. They're in another building and up a couple of flights of stairs. Other than that one nit-pick, there's nothing negative I could possibly say about the education I'm receiving.
The best part about Gnomon, that you don't really see until you've been around there a little bit, is the sense of community, and the contacts that you make. For instance, one of the certificate students who graduated just got a job at 'Rhythm and Hues.' Now we have one more contact in that studio, and another foot in the door when we're looking for a job. Every student becomes a contact for every other student, and there's a person at the school who's simply in charge of industry relations. She finds jobs, talks to studios, and manages these contacts.
Hope that helps you out a bit...