Musberger is a play by play guy (not a commentator) and as such he has, like many of the legends, both proponents and opponents. Brent likes good games. He likes underdogs. He likes favorites. He'd make a great politician.
I loved John Madden. My wife's family hated him over his perceived love for 'ole #4 (they are Vikes fans). Heck even Vin Scully and Jack Buck have critics (why, I do not know).
Like Keith Jackson, I would argue Brent is on a slow, but noticeable decline in his announcing prowess.
But, you KNOW it is a big game when you hear "You're looking live at [stadium name] on the campus of [university name]."
With that said, I prefer Brad Nessler, Sean McDonnaugh, or Verne Lundquist.