It's not correct to my ears to say that the sound quality is only average...
I know it depends on your own pairs, but I find it a very good one. There aren't a lot of 'on tour' shows that you can find on good audio sources. The main part of very good audience recordings were recorded during different Vegas/ Tahoe Seasons.
'America's Own Vol.2' is one of the few exceptions and it is one hell of a show, highlighted by Elvis playing the piano and singing a wonderful rendition of "You'll never walk alone". This is one show that you shouldn't miss.