I was also wondering the same thing, because I simmed 10 season in & really didn't see any real problems. After 10 season, there were a grand total of six 99 rated players vs 5 on the default roster. Also after 10 season, there was 175 90+ rated players vs 145 on the default...so there was a little inflation but pretty nice considering how it was in the past.
The highest rated team 10 seasons in was 89 and the lowest was 82. Most teams had really nice QB's, I actually edited a free agent QB to a 99 and sure enough one of the teams with a bad qb situation snapped him up in a week or two. BTW this was on the 360 with one imported class and the rest gerenated classes.