Wow. So I've been staying away from this thread to avoid having my option affected, and I'm really glad I did. It certainly wasn't a perfect show, but I'm surprised to see that it's so divisive.
This really hit me hard emotionally. A lot of personal stuff in my life came up as a watched, as I imagine it does for many people seeing this sort of show. The amount of time I spent crying might be more than any other show I've seen.
What I was actually most impressed with was the book, which might come as a surprise to some of the show's critics in this thread. True, the story was pretty far-fetched, but I didn't have an issue with that. The emotional and thematic scope of this piece is very ambitious and complex, but I personally think it handled that scope very well, balancing the development of each character and exploring the various emotional implications of this wild scenario. I found the structure very satisfying. Whenever I found myself wanting the show to return to a particular character or plot line, it always did.
The characters of Alana and Jared were less satisfying for me. They were clearly just plot devices, but I could appreciate why they were there. I think every school has someone who would have behaved exactly like Alana in this situation.
My only other issue with the book was that I think all the social media stuff felt like a bit of an overload, and seemed like it was trying really hard to be modern and relevant. For me, it distracted from what was really happening with the characters.
The score was definitely not their best. It often sounded very "generic contemporary musical theatre" to me, but I didn't mind because I think the songs were well-utilize to advance the story and develop the characters, which makes for really satisfying musical theatre overall, even if the songs themselves are not ones that I'd listen to very often on the cast album.
The performances were excellent. My favorites were both of the mothers, as well as Laura Dreyfuss and, of course, Ben Platt. If this does move to Broadway, I definitely see a nomination, and maybe even a win for him.
(side note: I realized during the show that Ben Platt would have made a really great Christopher in Curious Incident. Anyone agree?)
All in all, I think this is a wonderful piece of theatre, despite its flaws. It's hard to say whether this show will be remembered in 10-15 years, but I'm very glad I saw it now. I don't necessarily think it should go to Broadway, but if they decide to, I would certainly be rooting for their success.