I was there on Saturday, it was awesome, but I'm not sure if people that were there both nights are happy that they heard 8 (!) songs twice. If Metallica is going to do multiple nights at a fest they may want to try to switch it up even more. They are trying to be creative with the festival lineup, they should feel free to take their setlist decisions to the next level. Of course, each night they were tied to the full album concept, so I guess that limits your options.
I can completely understand feeling obligated to play Puppets and/or One both nights, but anything else should be fair game.... even Seek and Destroy (which, to me, is one of the most boring songs on KEA.... I'll never understand the fascination....).