Being from Mary White myself, I would of course say that Mary White is the absolute best of the colleges. It's the closest to classes, I have no idea how people from the other colleges manage to get up that hill every morning especially if they have a nine am class.
Plus we have a 6 million dollar renovation occurring at the moment, so the new rooms are absolutely fantastic, the heating works correctly in them, they are nice and large, can't say I'm overly fond of the color schemes but i currently live in one of the 1960s blocks so I cannot wait to move into the new rooms.
We are pretty much non existent in the inter college competitions ( we get the I didn't know Mary White was still open comment a lot) but it is a perfect environment for study. And if you want to go in the competitions you can, there's just no one really interested in them at Mary White at the moment.
The food isn't great, but I'm also a vegan so can't really comment on the extent of it. But if your looking at living in a college for 2011 definitely have a look at Mary White on the Open Days, it's also one of the cheaper colleges (excepting Wright Village of course which is incredibly cheap as you don't pay for food), plus with brand new rooms.