Well, you will get arguments on this matter all over the place.
However, it can be said that a thrust of the new renderings was to be more faithful to melodies the (Slavonic) Bokshaj Prostopinije. This thrust meant, for example, elimination of awful prokimenon settings that came out in the 1970’s. In the antiphons, it meant adhering to a common chant pattern rather than incorporating ad hoc adaptations for each verse. These adaptations, also from the 70’s, incorporated some musically questionable practices (placement of accents that deviated from the Slavonic and changed the character of the music) and had the effect of inhibiting the singing of festal antiphons for which ad hoc settings has either not been composed or were not known.
On the plus side the new settings are better musically; they handle the English better. On the minus side, some changes are so subtle enough that they are hard to learn: it is hard to change old habits to new ones when the difference is slight, especially if the singers can’t read music. Some of the music is more challenging, and some of the settings are also a little tricky for rank amateur singers - who have modest vocal technique, less than perfect diction, and don’t handle diphthongs in the most professional way. Most important on the plus side, the work of the Metropolitan Cantor Institute brought out many more settings of liturgical hymns in English than had been previously published in the Metropolia (still far short of Bokshay, Papp, Sokol, etc.), and music for vespers, matins, compline, etc.
ACROD has gone thought some recent rewriting of its English texts and its English prostopinije chants. I think that the MCI did, if not a perfect job, a much better one than ACROD, whose chants are often terribly awkward. They also take liberties in translations that would run afoul of the stricter Catholic sensibilities.
I don’t know first-hand what Bishop Nicholas thinks of the RDL, and the accompanying music. But he did the invite the head of the MCI to lead workshop on this music with his seminarians and clergy; I saw news of this on the ACROD website and on a Deacon’s blog. He is a great singer and a great devotee of prostopinije so I suspect that he will like much of what he hears.
Here is a nice link for people who like prostopinje:
rozhlas.sk/inetportal/web/index.php?lang=1&stationID=0&page=showRelacia&id=614&stationID=5