Oh OK, I think I definitely met you Question if you're who I think you are. I will agree with most of what you said (and most of what aarms said). I was initially a little irked because a few of the people I met earlier on Friday were a little frat-boyish or slightly awkward. I also did initially meet some awesome people, and I enjoyed hanging out with my host a lot.
I thought the bar night gave me a chance to meet way more people in a better setting and I met a ton of other prospects with cool backgrounds and interests who also seemed to value having fun and pursuing their life outside of school. This is just really important to me, because I view myself as a person before a medical student...that's just my priority in life.
I loved the informal atmosphere...of well, everything. The faculty don't take this authoritative stance over students, it seemed much more like a collegial environment where there weren't these strict hierarchies. Everyone was very approachable and I felt like they just wanted me to succeed and be happy. Sinai isn't flashy, but I don't really need this. I also had been worried that as a medical school only (no university affiliation) some of the interdisciplinary options may have been weak. But, really, after spending time talking to students I realized there are definitely enough things (and probably more so) that I'd even have time to pursue. I'm still hardcore into basic science research, and I didn't get a great sense of how emphasized/good that was at Sinai. I met a lot of people doing clinically/MPH related stuff, but as some still interested in basic science lab work and new technology development... I didn't meet a whole lot of people like me. This was good/bad...because I like being around people who have different passions than my own.
At the end of it though, I realized how much geography and fit really make and break it for me. I loved NYC and I loved that I can definitely have a life outside of school (meet new people, go out and have fun, break away from the med school bubble by walking a block to central park). I like the administration, and to be honest, it seemed like they really wanted everyone to be successful. I thought the students at the admit weekend were generally interesting...and I liked that a lot of students wanted to come because they LOVED Sinai rather than just because it was highly ranked. There was a lot of institutional pride that was justified by reasons other than..."we're so much more prestigious than such and such school", but rather concrete reasons. I'm also about 75% sure I'm gonna withdraw from Cornell....the weekend helped prove that to me. Many students (both current and prospective) seemed to be considering that option and I think most seemed to be leaning Sinai. Although, on another note, I felt it was wrong for one Sinai student to refer to Columbia kids as "pompous douchebags". That's not entirely fair.
Anyway, best of luck with all your decisions.
And good luck to the waitlisters. I'd venture to say it's probably going to move at least some bit. There definitely is a guaranteed 35 or so students already from the HuMed program and MD/PhD...so that really only leaves 100 or so spots to fill with attendees (and those who couldn't make it).