Er no, no, no, NO!
What a silly post!
First of all, what's with this silly 'should be at Oxbridge' crap? Cambridge and Oxford can only take so many people in this year. Therefore good people will be rejected. There's really nothing more to it than that! Its life. Which particular good people happen to get in or not get in can be quite arbitrary. And as people said before, how many people actually want to be at Oxbridge. I have countless friends who wouldn't go if they were made unconditional offers. Its not everybody's cup of tea!
As for people getting 2.2s at Oxbridge - you can't make sweeping blanket statements about them like that! First of all, in some subjects its not particularly unusual to get 2.2s. The grade breakdown in Architecture at Cambridge sees almost equal numbers of students getting 2.2s and 2.1s in each year. Getting a 2.1 in some subjects is objectively quite challenging. For instance I know several Natural Scienctists, Mathematicians and Engineers who have had 2.2s. I also know an extremely gifted and intelligent Philosopher who had a 2.2 for one year.
Secondly the Oxbridge student who got a 2.2 may have struggled to keep up with the speed and volume of work here. If you take a person who achieved a first on a course where they had 12 week terms with four assignments per term, and then you place them in a system with 8 week terms and 12 essays per term, you can't guarantee that they're necessarily going to achieve the first again under those conditions. Equally the person with a 2.2 might be in a better position to perform well in their examinations if they're given more time. The moral of the story is don't try and compare students/courses and so on from completely different systems and environments. The exercise is totally pointless and bound to be totally contingent.
Finally success in exams often give a poor representation of a person's capacity and even the amount of work they've put in. In Cambridge people spend hours churning out work for supervisions/tutorials (which don't count towards their grade) and this is often unreflected by the exams. Furthermore alot of people succeed in scraping by all year and suddenly throwing in a few weeks of hard work just before exams, and strategically choosing what to revise and their success is more a reflection of their ability to revise effectively and also perform well in exam conditions. The skills needed to write good exam essays are entirely unrelated from the skills needed to write good essays for supervisions, and good coursework, and many people excel at coursework but simply suck at exams.
This is also important if you want to compare Oxford and Cambridge to other Universities, because Oxbridge have very tight limits on the percentage of a person's grade that can be comprised of coursework rather than examinations. The amount of coursework we can take is less than is permitted at many other Universities in the country, which obviously disadvantages a person in the dilemma mentioned above.