My overall thoughts - James definitely struggled on some songs. But, there certainly sounds like there are some processing/effects/auto-tune errors applied to his vocal track that make things worst, IMO. If DT could get the raw, clean, un-effected vocal channel recorded from the show, an engineer could certainly make the performance sound better. Auto-tune in certain spots, done in a correct manner, some EQ, compression, reverb, etc... and his vocal would be fine (considering the difficulty of the set).
The band sounded incredible. Great mix on the instruments, the drums and bass in particular sound huge, I really like the mix instrumentally.
DT should hire the film crew that shot and edited this for their next official release. Seriously. This thing is gorgeous, the shots are great, the angles are fantastic, the video quality is awesome. And the editing and camera shot choices are spot on. Better than the last couple official concert films DT has put out from a video quality perspective.
Oh and the guitar solo at the end of TTT is sooooooo good. That's a classic JP moment if I've ever seen one.