I don't think the organizers are to blame for all the hypothermia cases. However, it wasn't clear that there was even a warming tent available. I ended up downstairs of some hotel with massage tables, probably a hundred or so of them with tons of volunteers helping. Not sure if that was technically the warming tent or not as it wasn't a tent.
Before the start, rules were changed to allow you to carry extra clear bags in addition to that 1gal ziploc. So basically, if anybody was cold before the start it was 100% their own fault. Yeah there was mud in athletes village, but that was expected so I prepared for it by bringing something to sit on plus the extra shoes.
I finished around 2:40 so before 99% of the others. I felt that I got the space blanket quickly enough, didn't seem like it was too far from the finish. After that I walked around looking for a heated bus I had been told about, to get warm as we were shaking by this point. We were eventually pulled into the warming room which was downstairs in a hotel. It was not at all obvious to find I'll add. We were given hot chicken broth and massages. They took my clothes off for me and gave me a dry shirt, but I don't imagine that they gave most people shirts as I was fairly early and they probably didn't know how bad it would get later. I was beginning to stop shaking by the time the massage was done (it was a very light massage, not done by pros or anything fancy). We were headed out to try to locate family but decided against going outside as we still had on wet clothes. I didn't have access to a gear drop bag because we were dropped off at the start and we went to the warming area before we found any family.
People keep asking me if I'd go back...I say that I won't go back next year but definitely within another 4 years. Would be cool to race in better weather when the crowd support is 100% and I can do more touristy things around Boston.