It's not that I think an offer from Oxford or Cambridge should entitle you to offers from other universities, or anything - I'm just curious.
I've been rejected by Bristol and Warwick so far. My personal take is that I don't particularly 'stand out' on paper; my grades are decent, but they're certainly not flawless. So I suppose I had more chances to 'prove myself' to Oxford - through the admissions test, the essay I submitted, and the interview. That, and I know different universities do have different criteria, and obviously I didn't meet the criteria at Bristol and Warwick.
So, did you get offers from all of your other choices, or did you get some rejections? And if so, do you have any ideas about where you went wrong with those universities?
Although I've not been rejected from any universities as yet (I have other offer besides Cambridge plus an interview for a possible insurance), I imagine that a lot of Oxbridge offer holders will have been rejected after, say, subsequently withdrawing from an interview for a university that would just offer AAA anyway.