Back to the original question in the thread, as people have pointed out since some univeristies only choose the best students, it would be impossible to really standardise university classes across the universities without some universities giving out 99% firsts, and others similar numbers of 3rds.
What doesn't seem fair, though, is the attitude that seems to be prevalent at the moment that it is somehow discriminatory for an employer to take someone on with a lower class of degree because they have gone to a particular university. Surely someone with a 2.2 from Oxbridge should be able to be taken over someone with a 2.1 from a former poly, simply because the degree proves more about that student's ability (they came at say the 80th percentile of students who are all in the top 10% of the country - this still puts them at say the top 8%). To do otherwise really is discriminatory.