Yeah Burgmann, Bruce, and Johns are the main three catered colleges. There's Ursies as well, but it's a bit... weird.
And Bruce dining area isn't dodge at all! Bruce is where I go; Eriny goes to Burgmann. I've written a fair few posts paying out Johns for being full of retarded jocks and sluts, but that's just my opinion - I know people who actually like it there (but I know other people who hate it there, so meh...).
As for facilities, well they'll all be pretty even really. All three of those colleges have the kind of facilities you'd need to survive. To be honest, you won't end up using a fair few of the facilities - I rarely go to the common rooms to watch TV (no one watches TV at college) - much more often to the Buttery = college bar. You spend most of your time in your own or your friends' rooms.
As for things to put down on your application - put everything you can think of. The head of Bruce is renowned for taking more quirky people the last two years, god knows why. Things like sporting achievements, leadership, travel, academic achievements, community service will all look good.