I bought a bigger size fridge for first year *not from mac* and have continued using it in res ever since. I find it is not only a luxury, but necessity...if you're going to cook for yourself on occasion and/or store many drinks. People that don't have big enough fridges are usually forced to put their food into the common room fridges, and sometimes those items can be stolen or ruined. For instance, last year a first year came to my room at midnight asking if I stole her tub of ice cream from the fridge! I've even had to store items in my fridge for other people that didn't have enough space. Just make sure that the fridge doesn't make too much noise, as mine sometimes bothers me at night.
PS. I've been in double and single rooms only, so I don't know if there would be enough room to have it in a triple.