With Junior being off TV last year, I forgotten how much he talks during a broadcast. Between the booth and the pit road reporters, I felt like I was watching an NBC broadcast. They did a good job.
The only time I ever saw issues with the picture quality is when they shifted from a standard break to something more regionalized. The PQ on those commercials was awful and it took a minute for the race coverage to clear up. Otherwise, the PQ was great. For anyone having issues with that, I'd recommend checking on your bandwidth and how much download speed you have.