I think the original 1977 TV Special is awful, and not just because of Elvis' sluggish performances. It is an amateur effort at best, and the fan comments ruin the whole thing as far as I'm concerned. Even worse than the original TTWII, and that's saying something.
As for the full shows, Elvis was in a rut the last couple of years, and the Omaha and Rapid City shows are non-events.
Of course, there were exceptions: Pittsburgh NYE '76 and Indianapolis '77 spring to mind.
But hey, it's Elvis, so we'll watch the stuff anyway.