Well, I was there, too, and 20 years later, I don't recall any musical complaints and it was great to be able to just walk down to the front row and dance. They were great fun and had the trampolines out.
However, I do remember that Santana came out and just blew Phish away...no comparison on who had the better chops on that day, Trey vs. Carlos.
And the latinos there for Santana seemed rather amused by Phish's showmanship.
It was fun to return to Merriweather for a Phish show in 2010 and have some young lass look at this old man and ask if this was my first Phish show, and I could say, "yeah, but, oh, I did see them open for Santana here back in '92"