Of course ALLEGRO isn't R&H's best show: the story is stabbing-through-the-head moralistic, the characters aren't very interesting (at times, it seems like every character has a big song except for Joe, including a girlfriend who only appears once), and the songs, while very pleasant, are derivative of R&H's previous work, and sometimes just dull ('You Are Never Away,' 'So Far').
But if anything is going to make a case for the show, this recording will. This recording is GORGEOUS. The orchestra actually sounds full and rich (unlike the one for the new SOUTH PACIFIC recording), the cast is great (Look for cameos from [of all people!] Howard Kissel and John Simon), everything is just gorgeous and perfect and wonderful.
If you can afford it, rush out and buy it right now. It's not the best R&H show out there, but the emotional impact that steadily builds throughout this recording pays off tremendously by the end.
"Y'know, I think Bertolt Brecht was rolling in his grave."
-Nellie McKay on the 2006 Broadway production of The Threepenny Opera, in which she played Polly Peachum