Graun was a composer of remarkable qualities - his ability to create ravishing melodies made him outstanding in his day, and it is wonderful that at least some of his works are being recorded and performed today.
It's just unfortunate that this particular recording suffers from two ordinary sopranos who fail to let the music shine in their performances. It's a great pity, because there's rather a gorgeous soprano duet in this work which is not given anything like the treatment it deserves.
The male voices are quite good. Stephen Genz is particularly noteworthy. The orchestral playing is fine, although not outstanding.
In all, the recording does not stand out as wonderful. It's a quite nice CD with a few less-than-nice moments (sung by the two women, I'm afraid). It certainly doesn't give the listener the full glory of Graun's music, but for anyone who simply must have this work, the recording's adequate (and occasionally better than adequate).
For first-time listeners to Graun, I recommend you look at purchasing the recording of "Cleoptra e Cesare" by Graun, performed with extreme beauty and stylish baroque approach. Now THAT is a treat...