The sound was uneven for sure, and dare I say, quiet at some times. I wonder if they are having difficulty mixing in Axl's vocals with the rest of the band and they need the band to be quiter for better dynamics? It was obvious during the beginning and middle of TWAT and the end of Coma. He was also having long conversations about something mic related which you can hear when he yells out near the end of TWAT.
When you see him live and you can tell he's trying to hit notes that just don't come out, it's tough because you can see he's reaching his physical limits trying to get there.