I was wait listed at UCSF this year. My stats: 4.0 from a top ten nursing school, five years critical care experience at another UC hospital campus, two years of clinical teaching experience, and volunteer experience. I got in and got a fellowship at UCLA. So, I think it's competitive. I would add that I was going for FNP with having mostly critical care experience, so that may've hurt me.
Someone who got into UCSF mentioned in another thread that, this year, the rate of admittance was around 12%. That said, from what I understand, all of the UC campus nursing programs
had a huge increase in the number of applicants this this year; who knows if that will happen for the 2013 cycle. UCLA and UCSF still offer Master's degrees (as opposed to DNP) and do not require the GRE, so they're very attractive nationally.
If you apply, be prepared for some mis- (or lack of) communication. During the application process, I sent a couple of emails to their generic nursing address that were never answered. I also never heard back from them about my status after applying. I ended up calling them out of curiosity in July (10 months after applying to the program) and was told over the phone that I didn't get in.