I have been to quite a few graduation ceremonies, and the real measure is the standard of grub offered afterwards.
My five in reverse order with scores out of 10.
5. UCL. Actually off putting. One bite, straight in the bin. 1/10
4. Christ College Cambridge. Basically just salt. 3/10
3. Royal Holloway. Average wedding buffet standard. 6/10
2. Bristol University. Really pleasant savoury, marvellous pastries. 8/10
1. Merton College Oxford. Rich bastards, even had a sit down with excellent vegetarian offering, lovely wine. Top class grub for everybody. 9/10