Well, parts of it are uplifting, to be sure - and certainly there's a good deal of humor in the piece, and the music is often rousing even when it's also seriously dramatic. But I'd tend to think that On The Town (or perhaps Wonderful Town) would be a much better fit for the definition, if we're going to stick to Bernstein.
But, much as I referred to "Press Release World" yesterday, I suppose "Advertisement World" is just down the street from there, lol.
I wonder what misplaced superlatives David Merrick would have used here? ;-)