First and foremost, this arrangement is incredible. Holy smokes, I'm not sure I'm going to have words to give voice to how much I like the solo soprano part, and the Debussy-esque floating just before the three-minute mark at 2:56 or so. Tremendous work here that everyone needs to experience that reminds me of the vocal stylings of Eric Whitacre and Christopher Tin -- and I don't make comparisons to either of them very often.
I agree with the judges that the production brings it down some, however. One of the problems of being compared to the great vocal arrangers of our time is that their work demands great vocal performers, and it's apparent that we don't have that in the choir here (save for the excellent soloists). For me, the bass clef choir voices -- especially the few moments they have to carry us forward -- really stand out as artificial, which brings me out of the experience. I'm a little surprised none of the judges had anything to say about 2:48 (the worst production moment for me after the initial vocal hold that's been discussed elsewhere), but will assume it's because the aforementioned pause is SO GOOD right after that.
That being said, it's one of the great vocal arrangements on the site, and we have precious few that make full use of a choir (largely for logistical reasons). Absolutely incredible arranging skills here -- if you ever need voice parts recorded, I imagine that you'll have a number of volunteers (including me, fwiw) happy to step up and help your work shine as brightly as it might.