I saw the LA production, which was revised somewhat before it opened on Broadway, but I agree that the opening number was enormous and magnificent!
I think the plethora of anthems in Act II is a mistaken attempt to compete with the anthemic second half of Act I. But nothing competes with "Wheels of a Dream" and "Till We Reach that Day"--and that's the problem with the second act: it never really competes with that brilliant first act.
I know a lot of posters here love "We Can Never Go Back to Before", but no matter how well crafted, it's still a song telling us what we already know, what we have in fact been seeing for 90 minutes. The review of that which we still remember can never compete with the Act I anthems that look FORWARD rather than BACKWARD.
And that is but one example.
"What a Game!" is a wonderful way to start Act II and, for me, "He Wanted to Say..." is dramatic musicalization at its best. But none of that changes the fact that, dramatically, we are basically waiting to see what Colehouse will do to avenge the death of Sarah. The rest is filler. Interesting filler, of course, but still filler, and not the sort of momentum that sends patrons rushing to their phones to tell everyone they know that they MUST see the show!
All that being said, it's still my favorite large-scale musical of the past 20 years. But it probably belongs in opera houses rather than on Broadway.