Most overrated: The Hal Prince production of "Sweeney Todd" (1979)
I saw the Staples High School (Westport, CT) production 2 years ago, and, without all that Princely pomposity, it was far superior. Admittedly, Staples is known as a great theatre school.
Exceptions:
--The lack of the astounding Angela Lansbury. Well, NO ONE can possibly match Ms. A.
--A truly unfortunate choice to employ the nonsensical modern day movie trope of the head-twist murder method (it's how Sweeney dispatches Mrs. Lovitt. Bleh.)
Other than those, it was cleaner, clearer, far more focused on the characters and story, without a bunch of distracting, attention-hogging directorial flourishes.
I'll go along with an overrated "Comet," but just barely. I admire what it was trying to do, and we thoroughly enjoyed being onstage right next to the actors. And everyone--every bit player, every stage hand, every major star--- worked so wonderfully hard, every second, to entertain. They used to call James Brown, "The hardest working man in show biz."
Well, I call Comet, "The hardest working show in show biz."