I looked around the day before College Hall opened, so everything wasn't quite finished, but the rooms looked very nice: a decent size, well furnished and nice colours (mostly cream with aubergine and dark blues/greens, if I remember correctly). Most of the rooms are en suite; they have a toilet/shower "pod". The pods are small, nice inside but don't look like they are of very rugged construction, so I wonder how long they will stay nice for...
The food in all the intercollegiate halls is - as of this year - provided by Harrisons, a contract caterer, so the food is very similar across all eight halls (the quality used to vary a lot between halls, but not any more - they're even trying to make the menus the same in every hall). It's perfectly edible and reasonably filling, although you do have to bear in mind that each resident pays only about £2.70 per day for breakfast & 3-course dinner, so it's obviously never going to be Michelin-star cuisine. Most people think it's "ok" - not great, but ok; a few people think it's disgusting. I suppose it depends what you're used to. I quite like the food (at Connaught Hall) - maybe I have low standards!
I'd say the downside to College Hall is the lack of a bar and there is only one proper common room. I've never lived there, so I don't know how much this impacts on the social life there, but I've always thought Connaught Hall's 2 common rooms, large comfortable reception lobby, and bar were major factors influencing residents' enjoyment on the hall. College Hall has a good warden's team, though, and I think they make the most of the facilities they have.