Okay, I actually just posted a similar response on Petros' thread about UCSD, but I'll be redundant anyways. 😉
Chef, it's worth it to go and check it out. Talk to AS MANY students as you can -- not just the ones who take you on your tour. However, keep in mind that the majority of medical students want to sell their school -- they want to recruit good applicants, and get them interested in their school, it's just sort of a pride thing.
I ended up declining to go to UCSD largely because of the "stressful" atmosphere I heard about there. However, now I wonder if maybe some of the negative comments I heard about UCSD had more to do with being in med school in general, and weren't really all that specific to UCSD. Maybe the UCSD students were just being more honest than the average med school student. I say this because I've been less than thrilled with my first year of med school so far, and I've been communicating with LOTS of other med students about this, both on this board, at my school, and at other schools around the nation, some of which have reputations for being extremely laid back (Yale and Tulane, specifically). Nearly all of the students have admitted to periods of high dissatisfication with their med school experience at one time or another -- for some it gets better, and others it doesn't.
I guess what I'm trying to say is that med school is not the rosy picture that may be portrayed during your interviews. Knowing what I know now, I would probably choose a school based on it's strengths in research and clinical training, the type of curriculum it uses (personally, I couldn't handle being in lecture all day, but that's me), location, and cost. Student happiness/satisfaction might factor into it, but probably not as much as it once did, just because I think that can be a difficult thing to evaluate, and it can vary tremendously from year to year, simply based upon the composition of the class.
As for UCSD specifically -- it is a great school that probably is on the rise in the next 5 years. Very strong in research, okay in clinical. Beautiful location and weather. Fun, young city. Cost of living is on the high side, and the housing market is tight. Seems like they have a highly supportive learning resource center for everything from individual tutoring to class notes, videos and study aids. Students raved about this. I was less than thrilled with my experience with their financial aid office, but I think that may be a general public school thing. Feel free to send me a private message or an email if you have any other questions about the school that I might be able to answer. Good luck.