I haven't watched/listened to the entire show yet. I did listen to the stuff with Taylor Swift and found her vocal (espescially on the first song) to be completely buried and sound like it was coming in from the distance. It did improve a bit with her second song but it was still pretty poorly mixed. Previous CMA Music Festivals have been mixed better then this so I wonder if someone new was behind the knobs. Taylor's not the strongest live singer but usually sounds better then that.
That said this is not the worst I've heard her mixed, the NFL Kick-Off concert last year was even worse, you could barely tell there were vocals at all. I believe that was mixed live so that's something there, this they could have tweaked in post and brought the vocals out a bit. That said she looked great as always!