From a recent interview with Chris, he stated the reason they aren't opening with Holy Wars is so when they finally play "Rust In Peace" the soundboard is dialed in and spot on. So if after the 1st 3 songs the mix is bad, you can bet your ass they aren't gonna go into "The main reason most people bought tickets" for.
I have read the boards too and they are all talking about a 2nd mixer, so I'm gonna side with the many and not the one here.
When I saw them in Atlanta they are awesome. Sucks you got a shit show in a small shit venue.