After seeing tonight's preview, I'm going to join the small group of dissenters who have mixed feelings about this show. I think there's a lot to like about it -- it's a fun show and a good time, and it's ambitious in what it tries to do. It's engaging and interactive -- the latter of which can't really be said about most Broadway shows. As a show and spectacle, I think it has the potential to be an unbelievably good experience.
But as a theatre piece, I found myself wanting more. I never saw the off-Broadway productions, so I don't know whether this would've worked better in a smaller, more intimate space. As a poster above said, I wanted more from the characters -- probably more than a 90-minute musical can afford.
Arielle Jacobs is terrific on vocals, but her heel turn as Imelda was too abrupt for me. If the idea behind the show is to have Imelda lull you into a sense of adoration, only to use that adoration against you as she furthers her brutal, autocratic, and kleptocratic conduct, I didn't get that from this show. And it's not Jacobs' fault -- as PipingHotPiccolo mentioned, we don't really dive into the why of Imelda, even though it's supposed to be a story about her (and the response to her).
Aquino only popped up when he was needed for exposition. I also wasn't sure why we were doing the same line dance for Aquino as we did for Imelda. The Order 1081 and Gate 37 sequences ran a little too long -- and some parts of those songs (among others) didn't really move the plot forward. I realize that's difficult to do with music like this, and I assume a lot of this will get tightened up during previews.
Perhaps the most concerning aspect of the show is the fact that it might be inaccessible to audience members who know nothing (or very little) about Imelda's story. I was with a friend who went in blind, knowing very little about Imelda Marcos (other than the name). He didn't understand the story, and found that it (1) moved too quickly, and (2) didn't dive deep enough for him to care. (And FWIW, the friend watches plenty of theatre, so the disconnect isn't due to theatre apathy.)
I think one change that they could make is for the audience interaction to go both ways -- not only to immerse people in Imelda's story, but also immerse people in the prelude to the People Power Revolution. There was some of that during the Just Ask Flowers sequence (and maybe elsewhere, too), but you need more immersion than just shuffling people around to and fro.
All that said, I'll go back to support the cast and see what changes get made. I don't know if there are ways to work out the shortcomings of the book, but if the powers that be figure it out, I think this could be a musical that does very well for a long time.