I went in 1991.
It was one of the best experiences of my life, and I'm very happy to done it.
But at some point, the school was sold to new owners, and they really changed up the program, and increased the tuition, so it's impossible for me to say how it is now.
Several of the former names who were there did leave, but some other guys have been there since my time. Fred Dinkins is a monster drum teacher; he was the guy everyone wanted to have as their private teacher back then, and he's still there, as are several other teachers.
Plus they added Rob Carson; I wish he had been there when I was.
As for people saying negative things about it, that's always been the case. Long before the internet, people have slagged on the school and hurled insults at it. The vast majority of the people who say it's terrible have never been there.
But to be fair, check out LAMA too, which was started by several former MI teachers, and where Ralph Humphrey and Joe Pocaro teach.