The biggest thing is how you play after you have games like that. The adjustment process is more complicated because quarterbacks are being asked to do more than they did even 10 or 15 years ago. And not so much because offenses are more sophisticated. The blitzes, and the coverages. Defenses force them to do more than they did.
Defenses are more complicated.
A case in point is McNown, a highly competitive sort who was outwardly distressed by an early season slump this year. He criticized Chicago fans for booing, only to apologize later. Of course, he knew what he was in for when he was drafted number one by an expansion team. With 14 starts as a rookie, he got far more playing time than any member of the Class of 1999. Culpepper, by far, had the least playing time as a rookie.