Phantom4ever said: ""Pure American fluff" with a healthy dose of sharp anti-McCarthyism satire in there :)
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I'm glad to see THE MUSIC MAN get its due here and I realize Annie didn't mean "fluff" in a bad way. But not only is the fluff used to explore themes such as hope, faith and love, the entire show--with its patter songs, barbershop quartet of town councilmen, hen-peeping town ladies, et al.--points forward to the "concept musical" of the following decade.
At its heart, the show may be naive in a peculiarly American way, but it isn't so different from the Americanized Don Quixote of MAN OF LA MANCHA (a serious, "dark" musical): If you believe in people (including yourself), you may inspire them to be better than they are.