As a huge fan of the original since I was very young, I'm rather protective of the score. But you may be surprised to hear that I really loved the new version.
We can quibble about things like the gospel wail ending of "Momma Look Sharp" (which I think worked very well), or whether Eddie Sauter's "Church Bells" ending is better (it is, but what they do here still works) etc - but for me, there was only one major misstep, in the music for "Compliments" toward the end of the show (where Abigail delivers the saltpeter), which I found too underplayed, compared to the excitement in the original.
Will I always prefer the original in general? Yes. But I did enjoy the new take on the score a lot.