I have a friend at uni in catered halls, he found most of his friends through dinner times and now they eat together every breakfast and dinner. Although he has said he would prefer a communal area as he tends to be stuck in his/friends rooms a lot, which for drinking together are not very big at all and most people end up sat on the floor, so that could be something to take into consideration? And also one other (small) problem he's found is that he doesn't have a freezer because of being catered so has to go out every week to buy food just for the weekend and can't cook anything in bulk really, but that could just be the halls he is in, others might have them 😂
To summarise.. they're social, people will probably come and sit with you if they see you on your own, everyone is nervous and in the same boat and noone knows anyone so you will always make friends.