I heard the performance over NDR Kultur on Saturday and was curious what others in this forum thought of it, so I appreciate the thread. It did bring to mind "Le Cid," and while that had its big impressive moments it also felt rather vacant and yes, unmemorable.
"Gunlod" initially felt like it was going down the same path. Act one felt like a bit of a slog, but from act two on I was fully engaged. The orchestral and choral writing were what impressed me. Wagnerian, yes (a passage for strings was straight out of the Prelude to Lohengrin) but I also heard son Siegfried Wagner at times.
My issue was the vocal variability. Perhaps in response to the challenging music written for him, Odin felt strained. Gunlod herself was more consistent, but seemed to stay within the range of one emotion, semi-exaltation. As Suttung, Gunlod's husband, Derek Ballard was the standout exception - one of the most impressive bass voices I've heard since Gottlob Frick.
If a label such as CPO does release this work, and I hope they do, I'd say find a new tenor, a new soprano, but keep the bass!