About ten years ago I went to Oxford to study as a postgraduate. The quality of the research I was supposed to be conducting was very, very poor, and I consider some of the practices I witnessed to be borderline fraudulent. It was quite a shock. (I eventually dropped out and studied at a non-famous university—which had its own problems but at least the research was sound.)

It's frankly heartening to see it drop down the rankings, although IMO generally too much emphasis is placed on these sorts of lists.