On a recent Celebrity cruise we found that it was impossible to get a seat in the buffet at lunch time unless you arrived 30 minutes before it opened. There were signs on every table asking guests to leave once they have finished eating their meal, but we found some people just ignored. Is this common on other cruise lines? We've only done 2 cruises and this is the first time encountering this problem. The food overall was good in both the buffet, MDR, and specialty restaurants. The lunch in the MDR was good, but we also liked the variety of food choices in the buffet for lunch and were frustrated we couldn't eat there at noon without having to plan ahead. On a Norwegian cruise we saw the buffet use a specialty restaurant as overflow seating at lunch time. Celebrity didn't do this as the buffet was at the other end of the ship to the restaurants.