I didn't have the highest expectations going into this. A few of the early boosters in this thread are people whose tastes...don't always align with mine, and I've been slightly underwhelmed by most of the hyped openers this season. I thought MAYBE HAPPY ENDING was fine, but whatever made people so passionate about it eluded me. I really enjoyed OPERATION MINCEMEAT, which had some incredible highs even if I don't think the whole entirely came together and I didn't quite love it. BOOP was fun and certainly joyful, but dumb and poorly written. Meanwhile the early videos they released of this were not inspiring.
I loved it.
This show is also joy, but joy with substance (vs Boop's sugary, cotton candy, substance-free version of joy; not necessarily anything wrong with that). The show manages to develop nearly a dozen characters with distinct personalities who feel like real people. The songs are terrific and well-integrated into a well-developed storyline (After so many bad books this season...here's one that's actually good!). There were a few instances early on where I thought it was obvious where the story was going...and then it didn't, subverting expectations in the best way. It touches on serious subjects and real issues, has dramatic and heartbreaking moments...but retains its humor and, yes, joy, for a truly full experience.
I'm usually annoyed when audience members are too reactive at random moments, but there was one moment here (a confrontation in the factory where the main character unexpectedly steps forward) that made me burst into applause. I was the only one at first (though a few others soon followed around the audience) because it was randomly in the middle of the scene (fuller applause ensued at the actual end of the scene.) So embarrassing, but I couldn't help it. I was that invested, and it was that good.
The only reason I think this show might be undervalued compared to the other openers is that it may be too "traditional" in style and structure (if not in subject) than some of the flashier or artsier options. But it accomplishes everything so well that it reminded me of the pleasures of a traditional musical. If this show isn't nominated for Best Musical, especially over Boop, Smash, or Just in Time, then the Tonys aren't worth a thing.
I wish the producers were being smarter about the pricing (especially the lottery pricing). This is a show that deserves to find an audience and appears to need all the help it can get.
TLDR: Go. It's terrific.