There are a lot of great songs (GOLD!, BOCA RATON, GET OUT OF MY LIFE, ADDISON'S CITY, etc.) and there are a lot of, frankly, bad songs (THE BEST THING THAT EVER HAS HAPPENED TO ME, WHAT'S YOUR RUSH?, THE GAME, etc.)
I still maintain that the show will never be great: Sondheim has labeled the Broadway try-out production that never came to anything as a show with 90% of what they originally wanted. But 10% rewrites aren't enough, because the show is a serious story trapped in a "musical comedy" concept (imagine a producer reading the final draft of WHO'S AFRAID OF VIRGINIA WOOLF? and saying "Yeah, it's great, but imagine what Jerry Herman could do with it!") In that respect, the show is also like MERRILY WE ROLL ALONG, which was also "not meant to be taken seriously" at one time.
"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