When we sailed Radiance last month...and I have to admit that for the first time we rarely ate in the main dining room. Our waiters were super nice...but for some reason getting the actual food to the table seem to be a problem. Also we weren't impressed with what was offered. I don't think it was bad...just not especially good.
So anyway we ate in Portofino's, Chops (excellent..but like's been said, who can eat there every dinner?) and Windjammer. Our favorite was the SeaView Cafe for late night snacks.
HAL has good food and Celebrity has great food.