Of making lists there is no end. Recently, I encountered a list of the 100 best musicals by Chris Caggiano (he of the now shuttered, but still pretty great, Everything I Know I Learned from Musicals blog).
Here’s his list (a little dated).
http://www.chriscaggiano.com/the-100-best-musicals-of-all-time.html
Top 3: Gypsy, My Fair Lady, and Sweeney Todd (with which I do not largely disagree except on the order, Eliza Doolittle is first for me, followed by the Demon barber, and “Just Where Would You Be…?”comes third. There is also a certain Bernstein musical that I would put before all three.
In general I agree with Chris (while noting that it doesn’t take into consideration the last decade).
Another crowdsourced list puts Les Miz tops. Followed by Phantom and Wicked.
That these would never be in my top 50 probably reflects age more than any more reasonable criterion. Unlike the other two, Wicked at least is great fun.
But really, when there is this to compare it to:
Is there anything more to say?
A Few Reasonable Words 