I just really wasn't impressed. MIT was the last school I visited, so in some ways it did have the hardest 'task' but then I think I would have been equally unimpressed if I'd started there.
First of all, there was practically no organisation to the day. I arrived about 30 mins early, and the person on the desk told me that they weren't ready and to come back later. When the day did finally start, they tried to cram about 20 people into a room designed for 10 so we could chat with someone from admissions. We did manage to have lunch with some students, but when it came to going to see a class none of our student 'guides' actually had a class that afternoon!
The class itself wasn't that much better. It was a strategy class and the prof seemed pretty good but the case they were reviewing was fictional! Rather than studying something that had actually happened, they were discussing a made up case simply to teach the point that you can't just take a successful strategy from one place and expect it to work somewhere else.
The facilities (that I saw) were, on the whole pretty poor. Yes, the new part of the building is nice, but it seems that classes are held in a much older building.
At the end of the day, I guess I was just expecting a bit more from a school that is supposed to be 'Top 10'. Compared to the other schools that I saw, I certainly didn't feel like MIT would give me good value for my $150k investment.