Just stumbled onto this thread:
TOP 3:
1) Cats - I didn't "get it"... and I know I wasn't "supposed to", but the whole thing was still "idiotic"
2) South Pacific - so I didn't see the revival... but of all the Rogers and Hammerstein's scores, I just don't love this one - which I realize is heresy. I've tried seeing this a couple of times, but it wasn't as enchanting (no pun intended), nor as emotional as I expected it to be.
3) The Music Man - just annoying... that's all.
SURPRISED I HAVEN'T SEEN ON ANYONE'S LIST (from what I could tell):
1) Carrie (198

- I know it wasn't seen by many, and the love for the original on this thread is legendary... but still surprised.
NOT SURPRISED I HAVEN'T SEEN ON ANY LISTS, AND HAPPY BECAUSE ITS THE BEST MUSICAL OF ALL TIME:
1) Ragtime