First off, congrats on your acceptances.
Next, I
really like USC. I'll address issues/comments people have mentioned so far:
Tuition - The cost definitely sucks. I don't get any financial help from parents or a spouse, so I'm taking the full cost of living out in loans. I shudder at the amount I'll have accrued by the time I graduate. However, it's not like I'm starving or saving pennies - it just means I'll live frugally for a longer period after I graduate and begin earning an income than some other people will.
Spanish - Definitely learn it if you're going to be anywhere in California. I'm nowhere near fluent, but can speak/understand at around an intermediate level and have found this to be helpful. There are beginner, intermediate, and advanced classes here on the med school campus for people who want to learn, so you don't have to commute to the undergrad campus. I'd suggest learning a bit before starting school, though.
A LOT (I think the majority) of my professors went to USC for med school, USC or somewhere else for residency, and are back now to teach. They truly do love it here, as far as I can tell. And speaking of profs, most of them are excellent lecturers. Some are phenomenal, a few are crappy, but by and large they're very good, spend a lot of time on their lectures and handouts, and all say we should contact them or come visit them if we have any questions or just want to discuss anything.
Anatomy lab - I looked at quite a few anatomy labs during my interviews last year, and being as unbiased as possible, our anatomy lab is AMAZING. First off, the smell isn't that bad. Obviously it's not pleasant either, but it's WAY less powerful than the smell in every other lab I saw. In the allopathic forum there have been threads dedicated to complaining about how the "anatomy smell" sticks with you for the entire year, in your skin, no matter how hard you scrub, and that the clothes you wear in lab smell so bad by the end of the year than you have to toss them. Totally not true here! I take a shower after lab, and don't smell a bit like formalin. I toss my scrubs in the wash, and they come out smelling like new. I actually wear the same shoes I wear in lab on other days, and they don't smell a bit. The price you pay for this amazing ventilation is that the lab is COLD, but if you wear a long-sleeved shirt under your scrubs (or a sweatshirt), and avoid the air vents, it's fine.
Library - It is really small. There's a nice lounge on the 1st floor, and good cubicles for studying on the 2nd floor, but overall it's not that great.
Kids - The campus itself is not in a great neighborhood for raising a family, but there are a lot of great neighborhoods relatively close to it. I don't know LA very well, but the parts I've seen of Monterey Hills (where a ton of 1st years live), Pasadena, and South Pasadena were really nice, residential, and quiet, with tree-lined streets and beautiful houses.
Clinical experience - County is incredible! This probably won't mean much now, but County gets kids with kernicterus, tons of leprosy cases, and a lot of other diseases that you would normally only see in 3rd world countries. And then you get to contrast all of that with University Hospital, which is also across the street and takes a lot of difficult cases from all over the country, and has a much wealthier population. We spend every Tuesday morning in the hospital, and alternate between University and County. The difference is so huge, and I honestly think just having one or the other would make for a very 1-sided clinical experience and training.
Commuting - Most people live within a 10-20 minute drive of the school (and that's including traffic). If you're really anti-commuting, it's easy to find a neighborhood to live in nearby.
Snobby students - Of course there are a few people with brand new BMWs, and some people who don't even need to take out loans, but that is definitely the minority. And even the people who are well-off are typically really nice and not snobby in the slightest.
Curriculum - I don't have any means of comparison, but I think our curriculum is pretty good. The number of hours in class isn't too bad, they tend to mix our days up with a combo of lecture and/or lab and/or small group discussions. We just started systems blocks (before it was "core principles" - pretty much just all the random foundation things they thought we needed), and so far I like how it's arranged. And P/F is a HUGE blessing. The one thing students consistently complain about is our "professionalism in the practice of medicine" class. It covers ethics, culture, professionalism, etc, in small groups, and is pretty touchy-feely. I don't mind it, but I was a psych major, so it's more up my alley.
Happiness of students - For being in medical school and having to spend the majority of their time studying, I'd say my classmates are really happy overall. Oddly enough, even during finals week most people are smiling (myself included). I don't really know how to quantify this, though.
Residency matching - I haven't explored this too much yet, but I did go to two dermatology and radiology meetings given by the residency directors for each. For rads, there were 17 applicants last year and 18 the year before, and all matched. For derm, there were something like 11 applicants last year and 8 the year before, and all matched. Both residency directors told us they personally oversee getting us into residencies - from getting us research projects, advising us throughout all 4 years, and looking over our personal statements/match list ranking/application, to getting us interviews at other programs and using their numerous connections all over the country to call in favors and help us the most they can. I don't know if this is the case at every med school, but I was pretty impressed.
I don't know the truth behind this, but I have heard multiple times that USC grads get so much intense clinical training at County that when they go on externships during 3rd and 4th years they sometimes have to teach other 3rd/4th years or even interns how to do certain things. Even if that's not true, I do know our experience/knowledge looks pretty impressive when we go on externships.
One of my roommates had to choose between UCI and USC last year, and she said the choice was really easy for her. I can't remember exactly why, but she said something about the clinical experience and facilities.
And there you have my very biased opinion.
GOOD LUCK TO EVERYONE WITH YOUR APPS AND DECISIONS! 
